Christian History

The history of Christianity began with the life of Jesus, an itinerant Jewish preacher and teacher, who was crucified in Jerusalem . His followers proclaimed that he was the incarnation of God and had risen from the dead. In the two millennia since, Christianity has spread across the world, becoming the world's largest religion with over two billion adherents worldwide.

Christianity was initially a grassroots movement spread within cities by apostles, reaching critical mass by the third century when it grew to over a million adherents. The support of the Roman emperor Constantine in the early fourth century was important in transforming it into an organized religion with a formalized religious text. Constantine's support also allowed Christian art, architecture, and literature to blossom. Competing theological doctrines led to divisions. Differing doctrines produced the Nicene Creed of 325, the Nestorian schism, the Church of the East and Oriental Orthodoxy. While the Western Roman Empire ended in 476, its successor states and its eastern compatriot—which became the Byzantine Empire—remained Christian.

In the Middle Ages, western monks preserved culture and provided social services. Early Muslim conquests devastated many Christian communities in the Middle East and North Africa, but Christianization continued in Europe and Asia and helped form the states of Eastern Europe. The 1054 East–West Schism saw the Byzantine Empire's Eastern Orthodoxy and Western Europe's Catholic Church separate. In spite of differences, the East requested western military aid against the Turks, resulting in the Crusades. Gregorian reform led to a more centralized and bureaucratic Catholicism. Faced with internal and external challenges, the church fought heresy and established courts of inquisition. Artistic and intellectual advances among western monks played a part in the Renaissance and the Scientific Revolution.

In the 14th century, the Western Schism and several European crises led to the 16th-century Reformation when Protestantism formed. Reformation Protestants advocated for religious tolerance and the separation of church and state and impacted economics. Quarrelling royal houses took sides precipitating the European wars of religion. Christianity spread with the colonization of the Americas, Australia, and New Zealand. Different parts of Christianity influenced the Age of Enlightenment, American and French Revolutions, the Industrial Revolution, and the Atlantic slave trade. Some Protestants created biblical criticism while others responded to rationalism with Pietism and religious revivals that created new denominations. Nineteenth century missionaries laid the linguistic and cultural foundation for many nations. In the twentieth century, Christianity declined in most of the West but grew in the East and Global South.

Early Christianity (c. 27 – fourth century)

First century

Christianity began with Jesus of Nazareth, a Jewish man and itinerant preacher in Galilee and the Roman province of Judea during the first century. Much about Jesus is uncertain, but his crucifixion is well attested. The religious, social, and political climate in both regions was extremely diverse and characterized by turmoil with numerous religious and political movements. One such movement, Jewish messianism, promised a messianic redeemer descended from Israel's ancient king, David, who would save Israel. Those who followed Jesus, called disciples, saw him as that Messiah.

Jesus was a prophetic figure who proclaimed an "end-of-the-world" eschatological message of the coming kingdom of God. Incarnation, the belief that God (or the Word of God) was embodied in Jesus, and resurrection, the belief that after his crucifixion, he rose from the dead, were Christianity's earliest beliefs. Its earliest rituals were baptism, a rite of initiation, and the communal Eucharist, a celebration in memory of Jesus' last meal before death.

The first Christian communities were predominantly Jewish. They gathered in small groups inside private homes where the typical setting for worship was the communal meal. Elders (called presbyters or bishops) oversaw the small groups, providing for the economic requirements of the meal and charitable distributions. Women comprised significant numbers of Christianity's earliest members. Religion had appeal because women could attain greater freedom through religious activities than Roman customs otherwise permitted. The Pauline epistles recognize their presence in early Christian congregations. Christianity most likely began in Jerusalem with fewer than 1000 believers, which grew to approximately one hundred small household churches, each with an average of seventy members, by the year 100.

Of the original believers, Jesus kept twelve disciples close to him who became known as the Apostles. Saul of Tarsus, who became Paul the Apostle, was a Jewish Pharisee who had not known Jesus and persecuted early Christians. According to his own account, his life turned in the opposite direction after experiencing a vision of Christ on the road to Damascus. Driven by belief and characterized by passion, the twelve Apostles and Paul identified evangelism as a task to be undertaken, which prompted them to travel through foreign lands sharing their message. Christianity was largely an urban religion that spread along the trade and travel routes into the Jewish diaspora and beyond. The largest cities in the Roman Empire, such as Rome, Alexandria, Antioch, Ephesus, and Carthage, all had Christian congregations by the end of the first century.

Despite martyrs such as Stephen, the movement grew, reaching Antioch where converts were first called Christian by non-Christians. From Antioch, Barnabas and Paul went to Cyprus, then Asia Minor, where the gospel was received by both Jewish and non-Jewish people. The conversion of Gentiles led to disputes with a group who desired observance of Mosaic law including circumcision. James, Jesus' brother, called the Council of Jerusalem () which determined that converts should avoid "pollution of idols, fornication, things strangled, and blood" but should not be required to follow other aspects of Jewish Law (KJV, Acts 15:20–21). As Christianity grew in the Gentile world, it underwent a gradual separation from Judaism. Disagreements over Jewish law, progenitors of Rabbinic Judaism, and insurrections against Rome, contributed to this separation. Nevertheless, Jewish Christianity remained influential in Palestine, Syria, and Asia Minor into the second and third centuries.

In the early centuries, the languages most used to spread Christianity were Greek, Syriac (a form of Aramaic), and Latin. Christian writings in Koine Greek, including the four gospels (the accounts of Jesus' ministry), letters of Paul, and letters attributed to other early Christian leaders, were written in the first century and had considerable authority, even in the formative period. Letters sent by Paul the Apostle to Christian communities were circulating in collected form by the end of the first century.

Ante-Nicene period (100–312)

The Christian faith spread east into Syria and Mesopotamia where the population spoke Aramaic, not Greek. Aramaic Christians were in Adiabene (northern Iraq) by the second century. By the second century Christianity was in North Africa, and by the third century, it had spread across the Mediterranean region, from Greece and Anatolia into the Balkans in the East, and as far as Roman Britain in the northwest.

Christianity's different ideas, combined with the social impact of the church, were pivotal to this growth. Christianity offered people new ways of thinking. For example, the idea that the power of God was manifested through Jesus in a reversal of power challenged Roman concepts of hierarchy.

The Ante-Nicene period included sporadic but increasing persecution from Roman authorities, as well as the rise of Christian sects, cults, and movements. Christians were persecuted by the empire because they did not uphold fundamental beliefs of Roman society and their withdrawal from public religion made them targets of suspicion and rumor. For most of its early centuries, Christianity was tolerated, and episodes of persecution were local. Emperor Nero's persecution of Christians during the mid-1st century was confined to Rome. There were no empire-wide persecutions until the 250s. Official persecution reached its height under Diocletian in 303–311.

In sociologist Rodney Stark's view, Christianity constituted an "intense community" which provided a unique "sense of belonging". Early Christianity demonstrates both inclusion and exclusion. Baptism was free and there were no fees, which made Christianity more affordable than traditional Roman religions. Belief in the resurrection of Jesus was the crucial and defining characteristic for becoming a Christian, and early Christianity was highly inclusive of any who expressed such belief. Ancient philosophy Professor Danny Praet writes that believers were also separated from unbelievers by a strong social boundary in a unique type of exclusivity based on belief rather than ritual in the traditional Roman fashion.

Women are prominent in the Pauline epistles and early Christian art, while much early anti-Christian criticism was linked to "female initiative" indicating their role in the movement. The church rolls from the second century list groups of women "exercising the office of widow".

There are few remnants of early Christian art, but the oldest, dated between 200 and 400, have been found in the catacombs of Rome. It typically fused Graeco-Roman style and Christian symbolism: the most common image was Jesus as the good shepherd.

By 200, Christian numbers had grown to over 200,000 people, and communities with an average size of 500–1000 people existed in approximately 200–400 towns. By 250, Christianity had grown to over a million. House churches were then succeeded by buildings designed to be churches, complete with assembly rooms, classrooms, and dining rooms. A more formal church government developed at different times in different locations. Bishops were essential to this development, and they rose in power and influence as they began to preside over larger areas with multiple churches.

The four gospels and the letters of Paul were generally regarded as authoritative, but other writings, such as the Book of Revelation and the epistles to the Hebrews, James, and 1 John, were assigned different degrees of authority. Gnostic texts challenged the physical nature of Jesus, Montanism suggested that the apostles could be superseded, and Monarchianism emphasized the unity of God over the Trinity. In the face of such diversity, unity was provided by the shared scriptures and bishops.

The fluidity of the New Testament in the first century does not seem to have affected belief in the Trinity as it connected to Christology and salvation. Christianity's central mystery, the Trinity, defines the Holy Spirit, Father, and Son as one God in three persons. However, there is an evolution of thought in the Patristic writings, then the development of the canon, and later in the theological controversies of the fourth century, that shaped the concept's development and gradually created a more technical Trinitarian vocabulary.

Late antiquity (313 – c. 600)

Late Antiquity was an age of change in which Christianity became a permitted religion, then a favored one that transformed in every capacity. In 313, the emperor Constantine, a self-declared Christian, issued the Edict of Milan expressing tolerance for all religions. Thereafter, he supported Christianity by giving bishops judicial power and establishing them as legally equal to polytheistic priests. He devoted personal and public funds to building churches and endowed them with funds to support their clergy. There were churches in the majority of Roman cities by the end of the fourth century.

Christian art, architecture, and literature blossomed under Constantine. The basilica, a type of Roman municipal court hall, became the model for Christian architecture. Frescoes, mosaics, statues, and paintings blended classical and Christian styles. Similarly, a hybrid form of poetry written in classical styles with Christian concepts emerged. In the late fourth century, Jerome was commissioned to translate the Greek biblical texts into the Latin language; this translation was called the Vulgate. Church Fathers of this period, such as Augustine of Hippo, John Chrysostom, Gregory of Nyssa, Athanasius of Alexandria, Basil of Caesarea, Gregory of Nazianzus, Cyril of Alexandria, and Ambrose of Milan, wrote vast numbers of works.

The ascetic ideal of these early Church Fathers was also embraced by monasticism, which had begun earlier in Syria, and was key to the development of Christianity. In Late Antiquity, these communities became associated with the urban holy places in Palestine, Cappadocia, Italy, Gaul, and Roman North Africa. In the 370s, Basil the Great founded the Basileias, a monastic community in Caesarea (Mazaca) which developed the first health care system for the poor, a forerunner of modern public hospitals.

Before the fourth century, Judaism had been an approved religion, while Christianity was persecuted as an illegal superstition; during the fourth century, Christianity became favored by emperors and Judaism came to be seen as similar to heresy. Still, Augustine of Hippo argued that Jews should not be killed or forcibly converted; they should be left alone because they preserved the teachings of the Old Testament and were "living witnesses" of the New Testament. Aside from the Visigothic Kingdom, Jews and Christians peacefully coexisted, for the most part, into the High Middle Ages.

Constantine and his successors attempted to fit the church into their political program. Church leaders responded with the first fully articulated limitation on secular authority based on the church as a separate entity, arguing that the church was not part of the empire so much as the empire was part of the universal church. During this period, the successors to Peter as Bishop of Rome (known as the Pope) had limited influence, and they lacked the power to break free of secular involvement in church affairs. However, papal influence rose as eastern patriarchs looked to the Pope to resolve disagreements.

Geographical spread

Christianity grew rapidly throughout this period. Christians in Persia, (present-day Iraq), were deeply persecuted in Late Antiquity, but their numbers still grew. A form of Christianity made inroads among Arabs in Palestine, Yemen, and Arabia. In the fourth century the percentage of Christians was as high in the Sasanian Empire as in the Roman Empire. Even as the Huns, Ostrogoths, Visigoths, and Vandals caused havoc in the Roman Empire in the fourth and fifth centuries, many of them converted to Christianity. Syria was home to a thriving theological school. The gospel was first brought to Central Asia and China by Syriac-speaking missionaries.

Christian institutions in Asia or East Africa never developed the kind of influence that the European churches and Byzantium held. Even so, in 301, the Kingdom of Armenia became the first nation to adopt Christianity as its state religion, soon followed by Caucasian Albania and the East African Kingdom of Aksum. Christianity, a minority faith in Britain since the second century, began to be displaced by Anglo-Saxon paganism in the fifth century. However, this process reversed after the Gregorian mission of 597. In the early fifth century, missionaries began converting Ireland.

Religious violence

Traditionally, scholars have seen the many Late Antique writings by Christians accusing other Christians of violent acts toward pagans and their places of worship as evidence of a widespread historical reality. In recent decades, a new generation of scholars have questioned this tradition seeking a clearer understanding of whether past violence was real and truly religious; others have downplayed historicity focusing instead on why these writings were written and what they were intended to produce.

In studies of the first type, a major trend uses modern archaeology. These discoveries have largely disconnected much of the rhetoric of religious violence from historical reality. For example, temple destruction is attested in 43 cases in the written sources, but only four are supported by archaeological evidence. Literature says Constantine ordered the destruction of the altar at Mamre building a church in its place. Archaeology found Constantine's church in a peripheral sector that left the rest unhindered. Libanius’ describes the destruction of the Serapeum using the image of monks descending on the countryside like locusts destroying everything in their path. Archaeology identifies the Serapeum as the only certain case of temple destruction in Egypt. Wendy Mayer writes that "Emerging from the results of these kinds of studies is a Late Antiquity in which religious violence was more local and sporadic than the narrated violence suggests, in addition to being misattributed or over-reported." There were violent incidents. However, their number was not high, most were local and limited, and some violent acts attributed to religion were not primarily religious.

Religious violence between pagans and Christians may not have been a general phenomenon, but there was a virulent legal hostility toward certain pagan practices. Blood sacrifice, which had been a central rite of virtually all religious groups in the pre-Christian Mediterranean, disappeared by the end of the fourth century due to hostile imperial laws. Still, Polytheism remained active into the fifth century, and in some places, into the ninth, even though popular support for the polytheistic religions had been in decline since the second century BC.

The second trend in scholarship has focused on the purpose of violent rhetoric and whether it was meant to encourage violent acts. Michael Gaddis says yes, these stories were used to rationalize and justify "zealous action enacting the anger of God against 'enemies of the faith’." However, the causal relationship between violent rhetoric and violent action has been difficult to demonstrate. Late Antique writings were composed after, not before, events. Therefore Gaddis further states that violent rhetoric was about connecting to the new identity that Christians wrote of themselves as 'victors'. Pagans were not all murdered or converted; they were simply excluded from that written rhetoric.

New public identities for both pagan and Christian led to increased competition. Persuasion, rhetoric and polemics became primary methods of debate centered on the true meaning of logos. Evidence from North Africa beyond Alexandria reveals apologetics in the critical role. Pagans asserted the true meaning of "logos" could be found in ancient myths and poetics as allegory. Christians asserted the Christian logos in their first true ontologies.

Constantine generally supported resolving religious disputes through debate, not violence, but in 304, Donatists formed a schism in North Africa, refusing, often violently, to accept back into the church those who had apostatized during Diocletian's persecution. The need to maintain public order and the ''pax deorum'' – the peace between Heaven and earth - made it the emperor's duty to impose acceptance through force. However, coercion was ineffective, and in 321, Constantine decided no more punishment would be given to Donatists, but their Catholic victims would become venerated as Christian martyrs. In 408, Augustine defended the government's violent response asserting that coercion could not produce genuine conversion, but it could soften resistance and make conversion possible. According to Peter Brown, Augustine thus "provided the theological foundation for the justification of medieval persecution".

Heresies, schisms and councils

Regional variants of Christianity produced diverse and sometimes competing theologies. Ancient Christians identified any practice or doctrine which differed from apostolic tradition as heresy. The number of laws directed at heresy indicate it was a much higher priority than paganism for Christians of this period.

For decades, Arianism embroiled the entire church, laity (non-clergy) and clergy alike, in arguing whether Jesus' divinity was equal to the Father's. The First Council of Nicaea in 325 attempted to resolve the controversy with the Nicene Creed, but some refused to accept it. Along the Eastern Mediterranean, where Christian factions struggled without resolution, Christian communities were weakened, affecting their long-term survival.

Biblical commentators between 300 and 600 mostly focused on aiding ordinary Christians whose main concern was sin and salvation. Christian baptism was distinctive and demonstrated how Christians understood these concepts in terms of the death of Christ. As theology evolved, it held to the paradox of God’s incarnation, as well as the decisive human contribution to redemption seen in Jesus Christ as "the new human being, who is God". Christian scriptures were formalized as the New Testament and distinguished from the Old Testament by the fourth century.

Despite agreement on these texts, differences between East and West were becoming evident. The West was solidly Nicean while the East was largely Arian. The West condemned Roman culture as sinful and resisted state control, whereas the East harmonized with Greek culture and aimed for unanimity between church and state. The marriage of clerics was accepted in the East but forbidden in the West. The East advocated sharing the government of the church between five church leaders, arguing that the Patriarchs of Constantinople, Alexandria, Antioch, and Jerusalem were equal to the Pope. Rome asserted that successors to Peter had superiority.

Controversies over how Jesus' human and divine natures coexisted peaked when Nestorius declared Mary as the mother of Jesus' humanity, not his divinity, thereby giving Jesus two distinct natures. This led to a series of ecumenical councils: the Council of Ephesus was the church's third council, and it condemned Nestorius. Held in 431, the church in the Persian Empire refused to recognize its authority. This led to the first separation between East and West. Two groups, one mostly Persian and the other Syrian, separated from Catholicism; Persians became the Church of the East (also known as the Assyrian, Nestorian, or Persian Church), while the majority of Christians in Syria and Mesopotamia became the Syrian Orthodox Church (Jacobite). This cut off the flourishing school of Syrian Semitic Christian theologians and writers from the rest of Christendom. The Church of the East lay almost entirely outside the Byzantine Empire. It became the principal Church in Asia in the Middle Ages.

In 451, the fourth council was the influential Council of Chalcedon. While most of Christianity accepted the Chalcedonian Definition, which emphasizes that the Son is "one person in two natures," there were those who found that description too close to the duality of Nestorianism, so after 484, they separated into Oriental Orthodoxy that sees only "One Nature of God the Incarnate Logos".

After 476

For five centuries after the fall of the Western Roman Empire in 476, Western culture and civilization were primarily preserved and passed on by monks. Those in the Eastern Roman Empire continued to see themselves as a Roman Empire with an emperor, a civil government, and a large army.

The religious policies of the Eastern Roman Emperor Justinian I () reflected his conviction that the unity of the Empire presupposed unity of faith: he persecuted pagans and religious minorities, purging the government and church bureaucracies of those who disagreed with him. Justinian contributed to cultural development, and integrated Christian concepts with Roman law in his ', which remains the basis of civil law in many modern states.

In Gaul, the Frankish king Clovis I converted to Catholicism; his kingdom became the dominant polity in the West in 507, gradually converting into a Christian kingdom over the next centuries. Papal influence rose as the church leaders increasingly relied on Rome to resolve many types of disagreement. Pope Gregory I gained prestige and power for the papacy by leading the response to invasion by the Lombards in 592 and 593, reforming the clergy, standardizing music in worship, sending out missionaries, and founding new monasteries. Until 751, the Pope remained a subject of the Byzantine emperor.

Early Middle Ages (c. 600–1000)

By the early 600s, Christianity had spread around the Mediterranean. However, between 632 and 750, Islamic caliphates conquered the Middle East, North Africa, and the Iberian Peninsula. Most urban Asian churches disappeared, but Christian communities established in remote areas between the fifth and the eighth centuries continued to survive. In the same period, war on multiple fronts contributed to the Eastern Roman Empire becoming the independent Byzantine Empire. Until the eighth century, most of Western Europe remained largely impoverished, politically fragmented, and dependent on the church.

During this period, invasion, deportation, and neglect left many communities without a church, leaving Christianity to syncretize with local pagan traditions. The church of this age was only indirectly influenced by the Bible. Nevertheless, "Christendom," the notion of all Christians united as a polity, emerged at the end of this age.

Monasticism and art

Until the end of the Early Middle Ages, Western culture was preserved and passed on primarily by monks known as "regular clergy" because they followed a : a rule. The rule included chastity, obedience and poverty sought through prayer, memorization of scripture, celibacy, fasting, manual labour, and almsgiving.

Monasteries served as orphanages and inns for travelers, and they provided food for those in need. They supported literacy, practiced classical arts and crafts, and copied and preserved ancient texts in their scriptoria and libraries. Dedicated monks created illuminated manuscripts. From the sixth to the eighth centuries, most schools were connected to monasteries, but methods of teaching an illiterate populace could also include mystery plays, vernacular sermons, saints' lives in epic form, and artwork.

This was an age of uncertainty, and the role of relics and holy men able to provide special access to the divine became increasingly important. Donations funding prayers for the dead provided an ongoing source of wealth. Monasteries became increasingly organized, gradually establishing their own authority as separate from political and familial authorities, thereby revolutionizing social history. Medical practice was highly important, and medieval monasteries were best known for their public hospitals, hospices, and contributions to medicine. The sixth-century Rule of Saint Benedict has had extensive influence.

The East developed an approach to sacred art unknown in the West, adapting ancient portraiture in icons as intercessors between God and humankind. In the 720s, the Byzantine Emperor Leo banned the pictorial representation of Christ, saints, and biblical scenes, and destroyed much early representational art. The West condemned the Byzantine iconoclasm of Leo and some of his successors. By the tenth and early eleventh centuries, Byzantine culture began to recover its artistic heritage.

Regional differences

Eastern Europe had been exposed to Christianity during Roman rule, but it was Byzantine Christianity, brought by the ninth-century saints Cyril and Methodius, that was integral to the formation of its modern states. Dukes and kings used the new faith to solidify their position and promote unity, while some directly enforced it with new laws, building churches, and establishing monasteries. The brothers developed the Glagolitic alphabet to translate the Bible into the local language. Their disciples then developed the Cyrillic script, which spread literacy and became the cultural and religious foundation for all Slavic nations.

In 635, the Church of the East brought Christianity to the Chinese Emperor Taizong whose decree to license the Christian faith was copied onto the Sianfu stele. It spread into northwestern China, Khotan, Turfan, and south of Lake Balkash in southeastern Kazakhstan, but its growth was halted in 845 by Emperor Wu-Tsung, who favoured Taoism. The Church of the East evangelized all along the Silk Road and was instrumental in converting some of the Mongolic and Turkic peoples. After 700, when much of Christianity was declining, there were flourishing Christian societies along all the main trade routes of Asia, South India, the Nubian kingdoms, Ethiopia, and the Caucasus region.

In Western Europe, canon law was instrumental in developing key norms concerning oaths of loyalty, homage, and fidelity. These norms were incorporated into civil law where traces remain. Within the tenets of feudalism, the church created a new model of consecrated kingship unknown in the East, and in 800, Clovis' descendant Charlemagne became its recipient when Pope Leo III crowned him emperor. Charlemagne engaged in a number of reforms which began the Carolingian Renaissance, a period of intellectual and cultural revival. His crowning set the precedent that only a pope could crown a Western emperor enabling popes to claim emperors derived their power from God through them. The Papacy became free from Byzantine control, and the former lands of the Exarchate became States of the church. However, the papacy was still in need of aid and protection, so the Holy Roman emperors often used that need to attempt domination of the Papacy and the Papal States. In Rome, the papacy came under the control of the city's aristocracy.

In Russia, the baptism of Vladimir of Kiev in 989 is traditionally associated with the conversion of the Kievan Rus'. Their new religious structure included dukes maintaining control of a financially-dependent church. Monasticism was the dominant form of piety for both peasants and elites who identified as Christian while retaining many pre-Christian practices.

Viking raids in the ninth and tenth centuries destroyed many churches and monasteries, inadvertently leading to reform. Patrons competed in rebuilding so that "by the mid-eleventh century, a wealthy, unified, better-organized, better-educated, more spiritually sensitive Latin Church" resulted. There was another rise in papal power in the tenth century when William IX, Duke of Aquitaine, and other powerful lay founders of monasteries, placed their institutions under the protection of the papacy.

High Middle Ages (c. 1000–1300)

Membership in the Christendom of this age began with baptism at birth. Every follower was supposed to have some knowledge of the Apostles' Creed and the Lord's Prayer, to rest on Sunday and feast days, attend mass, fast at specified times, take communion at Easter, pay various fees for the needy, and receive last rites at death. From 1198–1216, Pope Innocent III raised the papacy’s power to its greatest height as it gradually came to resemble the monarchies of its day.

The High Middle Ages saw the formation of several fundamental doctrines, such as the seven sacraments, the just reward for labour, "the terms of Christian marriage, the nature of clerical celibacy and the appropriate lifestyle for priests". Heresy was more precisely defined. Purgatory became an official doctrine. In 1215, confession became required for all. The rosary was created after veneration of Mary, mother of Jesus became a central aspect of the period.

Beginning at Cluny Abbey (910), which used Romanesque architecture to convey a sense of awe and wonder and inspire obedience, monasteries gained influence through the Cluniac Reforms. However, their cultural and religious dominance began to decline in the mid-eleventh century when secular clergy, who were not members of religious orders, rose in influence. Monastery schools lost influence as cathedral schools spread, independent schools arose, and Medieval university, universities formed as self-governing corporations chartered by popes and kings. Canon and civil law became professionalized, and a new literate elite formed, further displacing monks. Throughout this period, the clergy and the laity became "more literate, more worldly, and more self-assertive".

Centralization, expulsions and Investiture

The Gregorian Reform, reform of Pope Gregory VII (1073–1085) began "a new period in church history" by pressing for an end to simony (the sale of church offices), the enforcement of clerical celibacy, and the establishment of papal supremacy. Previously, the power of kings and emperors had been (at least partly) founded on connection to the sacred. Gregorian Reform intended to divest Western rule of that sacramental character, free the church from state control, and establish the preeminence of the church. The reform process reinforced the pope's temporal power, enabling a reorganization of the administration of the Papal States which brought a substantial increase in wealth, consolidated territory, centralized authority, and established a bureaucracy.

As newly centralized states demanded greater cultural conformity from their citizens, canon laws were created that left out Christianity's earlier principles of equity and inclusivity. The medieval church never officially repudiated Augustine's doctrine of protecting the Jews, but legal restrictions increasingly enabled treating them as outsiders. Throughout the medieval era, local rulers Expulsions and exoduses of Jews, evicted Jews from their lands and confiscated property.

In the preceding era of raids by Muslim pirates and Viking warriors, church leaders had been forced to seek protection by nobles who then saw it as their right to control the institutions they protected. In 1061, Pope Nicholas II moved to protect the papacy from secular control by establishing that popes could only be elected by a College of Cardinals, however, both the nobles and the church still claimed the right to appoint bishops. This led to the Investiture Controversy, a conflict between the Holy Roman Emperor Henry IV, Holy Roman Emperor, Henry IV and Pope Gregory VII over the secular appointment of bishops and abbots and control of their revenues in the Holy Roman Empire. For the church, ending lay investiture would support independence from the state, encourage reform, and provide better pastoral care. For the kings, ending lay investiture meant the power of the Holy Roman Emperor and the European nobility would be reduced.

The ' of 1075 declared that the pope alone could invest bishops. Disobedience to the Pope became equated with heresy; when Henry IV rejected the decree, he was Excommunication (Catholic Church), excommunicated, which contributed to a Saxon revolt of 1077–1088, civil war. A similar controversy occurred in England. Struggles over division of power between church and state continued throughout the medieval era.

Schism, crusade, spread, and retraction

The Church of the East, which had separated after Chalcedon, survived against the odds with help from Byzantium. At the height of its expansion in the thirteenth century, the Church of the East stretched from Syria to eastern China and from Siberia to southern India and southern Asia. Along with geographical separation, there had long been many cultural differences, geopolitical disagreements, and a lack of respect between east and west. Their second separation took place in 1054 when the church within the Byzantine Empire formed Byzantine Eastern Orthodoxy, which thereafter remained in communion with the Ecumenical Patriarchate of Constantinople, not the Pope.

Christianity was declining in Mesopotamia and inner Iran, although some Christian communities continued to exist further to the east. As churches in Egypt, Syria, and Iraq became subject to fervently Islamic militaristic regimes, Christians were designated as Dhimmi, ''dhimmi'', a status that guaranteed their protection but enforced their legal inferiority. Different communities adopted various survival strategies: some withdrew from interaction, others converted to Islam, and others sought outside help. The Byzantine emperor Alexios I Komnenos asked Pope Urban II for help with the Seljuk Empire, Seljuk Turks in 1081, and in 1095, Urban asked European Christians to "go to the aid of their brethren" in counterattack against the inroads of Islam.

Urban's message had great popular appeal. Drawing on powerful and prevalent aspects of folk religion, it connected pilgrimage, Charity (practice), charity, and absolution with a willingness to fight. It gave ordinary Christians a tangible means of expressing brotherhood with the East and carried a sense of historical responsibility. Tens of thousands answered. Among the first was Peter the Hermit who led the People’s Crusade to a disastrous end in 1096. Eight Crusades, which lasted from 1096 to 1272, had little to no overall military success, failed as a religious endeavor, contributed to the development of national identities in European nations and, eventually, increased division with the East. Scholars struggle with no agreement on estimates of how many died.

The Chivalry, cult of chivalry, which upheld the ideal of the Christian knight, emerged with powerful and wide-spread social and cultural influence before its decline during the 1400s. Another significant effect of the Crusades was the invention of the indulgence.

The Christianization of Scandinavia occurred in two stages: first, in the ninth century, missionaries operated without secular support; then, a secular ruler would begin to oversee Christianization in their territory until an organized ecclesiastical network was established. By 1350, Scandinavia was an integral part of Western Christendom.

Renaissance, science and technology

The Christian wars of Reconquista, reconquest, which lasted over 200 years, had begun in Italy in 915 and in Spain in 1009 to retake territory lost to Muslims, causing fleeing Muslims in Sicily and Spain to leave behind their libraries. Between 1150 and 1200, monks searched those libraries and found the works of Aristotle, Euclid, and other ancient writers.

The West's rediscovery of the complete works of Aristotle led to the Renaissance of the twelfth century. It also created conflict between faith and reason, resolved by a revolution in thought called scholasticism. The scholastic writings of Thomas Aquinas impacted Catholic theology and influenced secular philosophy and law into the modern day. Monks revived the scientific study of natural phenomena, which laid the necessary foundation that eventually led to the Scientific Revolution in the West. There was no parallel Renaissance in the East.

Byzantine art exerted a powerful influence on Western art in the twelfth and thirteenth centuries. Gothic architecture, intended to inspire contemplation of the divine, began in the same centuries.

The Cistercians, Cistercian movement was a wave of monastic reform after 1098. Cistercians were instrumental in promoting Medieval technology, technological advancement and were among the best industrialists of the Middle Ages. Of the 740 twelfth-century Cistercian monasteries, nearly all possessed a water wheel that they used to produce olive oil or forge metal and produce iron.

Challenges and repression

The twelfth century saw a change in the goal of a monk from contemplative devotion to active reform. Among these new activist preachers was Saint Dominic, Dominic who founded the Dominican Order and was significant in opposing Catharism. In 1209, Pope Innocent III and King Philip II of France initiated the Albigensian Crusade against Catharism. The campaign took a political turn when the king's army strategically seized and occupied lands of nobles who had not supported the heretics, but had been in the good graces of the Church. It ended in 1229 when the region was brought under the rule of the French king, creating southern France, while Catharism continued until 1350.

Moral misbehaviour, such as sexual misconduct, being drunk and disorderly in public, or heresy by either laity or clergy, was prosecuted in Inquisition, inquisitorial courts. These courts, which were composed of both church and civil authorities, were established when someone was accused, then after prosecution, they were dissolved. Though these courts had no joint leadership nor joint organization, the Dominican Order held the primary responsibility for conducting inquisitions. The Medieval Inquisition brought between 8,000 and 40,000 people to interrogation and sentencing; death sentences were relatively rare. The penalty imposed most often was an act of penance which might include public confession.

Bishops were the lead inquisitors, but they did not possess absolute power, nor were they universally supported. Inquisition became stridently contested as public opposition grew and riots against the Dominicans occurred. The Fourth Lateran Council of 1215 empowered inquisitors to search out moral and religious "crimes" even when there was no accuser. In theory, this granted them extraordinary powers. In practice, without sufficient local secular support, their task became so overwhelmingly difficult that inquisitors were endangered and some were murdered.

From 1170-80, the Jewish philosopher Moses ben Maimon (commonly known as Maimonides) wrote his fourteen-volume code of Jewish law and ethics, titled the "Mishneh Torah". A turning point in Jewish-Christian relations occurred when the Talmud was Disputation of Paris, put "on trial" in 1239 by the French King Louis IX of France, Louis IX and Pope Gregory IX because of contents that mocked the central figures of Christianity. Talmudic Judaism came to be seen as so different from biblical Judaism that old Augustinian obligations to leave the Jews alone no longer applied. A rhetoric with elaborate stories casting Jews as enemies accused of ritual murder, blood libel, and desecration of the Christian eucharist host grew among ordinary folk. The spread of the Black Death led to attacks on Jewish communities by people who blamed them for the epidemic. Jews often acted as financial agents for the nobility, providing them usury, loans with interest while being exempt from certain financial obligations. This attracted jealousy and resentment. Count Emicho, Emicho of Leiningen massacred Jews in search of supplies and protection money, while the History of the Jews in England (1066–1290)#Massacres at London, Bury and York (1189–1190), York massacre of 1190 also appears to have originated in a conspiracy by local leaders to liquidate their debts.

The nobility of Eastern Europe prioritized subduing the Balts, the last major polytheistic population in Europe, over crusading in the Holy Land. In 1147, the ''Divina dispensatione'' gave these nobles indulgences for the first of the Northern Crusades, which intermittently continued, with and without papal support, until 1316. The clergy pragmatically accepted the forced conversions the nobles perpetrated despite continued theological emphasis on voluntary conversion.

Renaissance and Reformation (c. 1300–1650)

Division in the West

Crisis of the late Middle Ages, The many calamities of the "long fourteenth century", which included Bubonic plague, plague, Great Famine of 1315–1317, famine, Hundred Years' War, wars, and Popular revolts in late medieval Europe, social unrest, led European people to believe Christian eschatology, the end of the world was imminent. This belief ran throughout society and became intertwined with anti-clerical and anti-papal sentiments. Criticism of the church became an integral part of late medieval European life, and was expressed in both secular and religious writings, and movements of heresy or internal reform. Most attempts at reform between 1300 and 1500 failed.

In 1309, Pope Clement V fled Rome's factional politics by moving to Avignon in southern France. By leaving Rome and the "seat of Peter" behind, this Avignon Papacy, consisting of seven successive popes, unintentionally diminished papal prestige and power. Pope Gregory XI returned to Rome in 1377. After Gregory's death the following year, the papal conclave elected Urban VI to succeed him, but the French cardinals disapproved and elected Robert of Geneva instead. This began the Western Schism, during which there was more than one pope. In 1409, the Council of Pisa's attempted resolution resulted in the election of a third separate pope. The schism was finally resolved in 1417, with the election of Pope Martin V.

Throughout the Late Middle Ages, the church faced powerful challenges and vigorous political confrontations. The English scholastic philosopher John Wycliffe (1320–1384) urged the church to embrace its original simplicity, give up its property and wealth, end subservience to secular politics, and deny papal authority. Wycliffe's teachings were condemned as heresy, but he was allowed to live out the last two years of his life in his home parish. In 1382, the first English translation of the Bible, known as Wycliffe's Bible, was published. Wycliffe's teachings influenced the Czech theologian Jan Hus (1369–1415) who also spoke out against what he saw as corruption in the church. Hus was convicted of heresy and burned at the stake. This was the impetus for the Bohemian Reformation and led to the Hussite Wars.

Meanwhile, a vernacular religious culture called the ''Devotio Moderna'' attempted to work toward a pious society of ordinary people. Through the Dutch scholar Erasmus, Desiderius Erasmus Roterodamus (1466–1536), Christian humanism grew and impacted literature and education. Between 1525 and 1534, William Tyndale used the Vulgate and Greek texts from Erasmus to create the Tyndale Bible. King James commissioned the King James Version in 1604, using all previous versions in Latin, Greek, and English as sources. It was published in 1611.

East and Renaissance

In 14th-century Byzantium, Gregory Palamas, St. Gregory Palamas, defended hesychast spirituality and the Orthodox understanding of God, writing his most influential work, "Triads", in 1341 against the criticisms of Barlaam of Seminara, Barlaam a Calabria, Calabrian humanist philosopher.

A reunion agreement between the Orthodox and Catholic churches in 1452 was negated by the Fall of Constantinople to the Ottoman Empire in 1453, which sealed off Orthodoxy from the West for more than a century. Islamic law did not acknowledge the Byzantine church as an institution, but a concern for societal stability allowed it to survive. Financial handicaps, constant upheaval, simony, and corruption impoverished many, and made conversion an attractive solution. This led to the state confiscating churches and turning them into mosques. The patriarchate became a part of the Ottoman system under Suleiman the Magnificent (1520–1566), and by the end of the sixteenth century, widespread desperation and low morale had produced crisis and decline. When Cyril Lucaris, Cyril I Loukaris (1572 – 1638) became Patriarch in 1620, he began leading the church toward renewal. A shared hostility towards Catholicism led Cyril to reach out to the Protestants of Europe and to be deeply impacted by their Reformation doctrines. Protestant pressure produced the Cyril_Lucaris#Calvinism, Lukaris Confession embracing Reformed Christianity, Calvinism.

The flight of Greek scholars in the Renaissance, Eastern Christians from Constantinople, as well as the manuscripts they carried with them, were important factors in stimulating literary renaissance in the West. The Catholic Church became a leading patron of Renaissance art, art and Medieval architecture, architecture, commissioning work and supporting renowned artists. Even while fifteenth-century popes struggled to reestablish papal authority, the Renaissance Papacy transformed Rome by rebuilding St. Peter's Basilica and establishing the city as a prestigious centre of learning. Reformation Protestants condemned these popes as corrupt for their lack of chastity, nepotism, and selling "hats and indulgences".

In Russia, Ivan III of Russia adopted the style of the Byzantine imperial court to gain support among the Rus' elite who saw themselves as the new 'chosen' and Moscow as the New Jerusalem#Eastern Christianity, New Jerusalem. Jeremias II (1536–1595), the first Orthodox patriarch to visit north-eastern Europe, founded the Russian Orthodox Church, Orthodox Patriarchate of Russia during his journey.

The History of the Catholic Church in Japan, sixteenth-century success of Christianity in Japan was followed by severe repression, such as the crucifixion of the 26 Martyrs of Japan.

Colonialism and missions

Colonialism, which began in the fifteenth century, originated either on a militaristic/political path, a commercial one, or with settlers who wanted land. Christian missionaries soon followed with their own separate agenda. "Companies, politicians, missionaries, settlers, and traders rarely acted together" and were often in conflict. Some missionaries supported colonialism while others took stances against colonial oppression.

Between 1500 and 1800, Catholic Christianity gained followers worldwide through missionaries from the Spanish Empire, Spanish, Portuguese Empire, Portuguese, and First French Empire, French empires. During the Hispanic colonization of the Americas, Latin America largely became a New World form of History of the Catholic Church in Spain, Iberian Catholicism, while the merging of native and Spanish traditions also created a multitude of indigenous Christianities. Spanish missionaries tried to suppress the trade in Indigenous peoples of the Americas, Amerindian slaves in the Caribbean, but the Catholic church became one of the largest holders of black slaves.

Long before the first European colonists arrived, indigenous Christian communities, which were often in conflict with the newcomers, had existed in Asia and Africa. Prior to the Portuguese' landing, Saint Thomas Christians, St.Thomas Christian communities in southern India had existed continuously for more than 1000 years. In the 16th century, baptized Kongolese Christians were taken by Portuguese slavers to the Caribbean and Brazil where there are clear traces that they evangelized among their fellow sufferers. Thereafter, former slaves returned to West Africa "with Bible in hand", founding Freetown, which played a central role in the Christianization of West Africa.

In the seventeenth and eighteenth centuries, Reductions, reductionist villages for natives in regions of Paraguay, Argentina, and Brazil were established by Jesuits and other orders. Jesuits promoted local skills and technical innovations, working exclusively in the native language to form an "agrarian collective" kept separate from the rest of colonial society, with serfdom and forced labor forbidden. The Spanish crown resented this autonomy, and the Jesuit order was banned; its members were expelled from Spain in 1767. Thereafter, reduction territories became open to settlers, and natives often became bondmen.

Women, witch frenzy, and Modern Inquisition

Women in the Middle Ages were considered incapable of moral judgment and authority. However, there were women who became distinguished leaders of nunneries, exercising the same powers and privileges as their male counterparts, such as Hildegard of Bingen (d. 1179), Elisabeth of Schönau (d. 1164/65), and Marie d'Oignies (d. 1213). In 1141, Hildegard began writing the first of her three-volume theology on her visions. Although the Catholic Church had long ruled that witches did not exist, the conviction that witches were both real and malevolent developed throughout fifteenth-century European society. No single cause of "witch frenzy" is known, although the Little Ice Age is thought to have been a factor. Approximately 100,000 people, of whom 80% were women accused by those in their own villages, were prosecuted in mostly civil trials between 1561 and 1670; 40,000 to 50,000 were executed.

Between 1478 and 1542, the Spanish and Portuguese inquisitions were initially authorized by the church but soon became state institutions. Authorized by Pope Sixtus IV in 1478, the Spanish Inquisition was established to combat fears that Jewish converts were conspiring with Muslims to sabotage Hispanic Monarchy (political entity), the new state. Five years later, a papal bull conceded control of the Spanish Inquisition to Spanish monarchs, making it the first national, unified, centralized institution of the nascent Spanish state. The monarchy centralized state power by absorbing military orders, adapting Santa Hermandad, police organizations and the Inquisition for political purposes.

The Portuguese Inquisition, controlled by a state board of directors, incorporated anti-Judaism before the end of the fifteenth century. Many of these forcibly converted Jews, known as New Christian, New Christians, fled to Portuguese India, Portuguese colonies in India, where they subsequently suffered as targets of the Goa Inquisition. The bureaucratic and intellectual Roman Inquisition, best known for its condemnation of Galileo, served the papacy's political aims in Italy.

Reformation

Supported by secular and canon law, the fourteenth century had been among the most violently oppressive of times for Minority group, minorities in Western Europe. Protests against the church led to the Protestant Reformation which began when the Catholic monk Martin Luther nailed his ''Ninety-five Theses'' to the church door in Wittenberg in 1517. Luther challenged the nature of the church's role in society and its authority, which Luther asserted was determined by two realms of human existence, the secular and the sacred, where one is not allowed to dominate the other, and only secular authority has the right to use force. For Catholics, authority meant the Pope. For the protesters, authority was in the priesthood of believers and Scripture. Edicts issued at the Diet of Worms in 1521 condemned Luther.

After protracted and acrimonious struggle, three religious traditions emerged alongside Roman Catholicism: the Lutheranism, Lutheran, Reformed Christianity, Reformed, and Anglicanism, Anglican traditions. Reformed churches, formed by followers of theologian John Calvin, argued that the church had the right to function without interference from the state, and they established the ideal of a Representative democracy, constitutional representative government in both the church and in society. Puritans and other English Dissenters, Dissenter groups in England, Huguenots in France, Dutch Reformed Church, “Beggars” in Holland, Covenanters in Scotland who produced Presbyterianism, and Pilgrims (Plymouth Colony), Pilgrim Fathers of New England are Reformed churches that trace their theological roots to Calvin. The Anglican church was first created as the Church of England by Henry VIII (1491 – 1547) who severed it from papal authority and appointed himself Supreme Head of the Church of England. Henry preserved Catholic doctrine and the church's established role in society.

The Roman Catholic Church responded in the Counter-Reformation, spearheaded by ten reforming popes between 1534 to 1605. The Council of Trent (1545–1563) answered each Protestant claim, and laid the foundation of modern Catholic policies. New monastic orders were formed, including the Society of Jesus – the "Jesuits" – who adopted military-style discipline and strict loyalty to the Pope. Monastic reform also led to the Spanish mystics and the French school of spirituality, as well as the Eastern Catholic Churches, Uniate church which used Eastern liturgy but recognized the authority of Rome.

Quarreling royal houses, already involved in dynastic disagreements, became polarized into the two religious camps. In 1562, France became the centre of French Wars of Religion, a series of wars, of which the largest and most destructive was the Thirty Years' War (1618–1648). While some scholars argue that these wars were varieties of the just war tradition for religious liberty and freedom, most historians argue that the wars were more about nationalistic state-building and economics, and less about religion.

Modern period (1650–1945)

Ideological movements

The era of Absolutism (European history), political absolutism followed the breakdown of Christian universalism in Europe. Abuses from absolutist Catholic kings gave rise to a virulent critique of Christianity that first emerged among the more extreme Protestant reformers in the 1680s as an aspect of the Age of Enlightenment. For 200 years, Protestants had been arguing for religious toleration, and by the 1690s, secular thinkers were rethinking the state's reasons for persecution, and they too began advocating for religious toleration. Concepts of freedom of religion, Freedom of speech, speech, and Freedom of thought, thought began being established in the West.

Secularisation spread at every level of European society. Pioneered by Protestants, Biblical criticism advocated historicism and rationalism to make study of the Bible more scholarly and secular in the 1700s. In reaction to rationalism, pietism, a holiness movement within Lutheranism, began in Europe and spread to the Thirteen Colonies where it contributed to the First Great Awakening, a religious revival of the 1700s. Pietist Moravians came to Georgia (U.S. state), Georgia in 1732 where they influenced John Wesley, an Anglican missionary in Savannah. After returning to England, Wesley began preaching in open-air meetings, leading to the creation of the Methodism, Methodist church. In the colonies, Presbyterians and Baptists contributed to revival, and to divisions over it, which formed political parties and lent crucial support for the American Revolution. Spurred by Christians of varying sects, Thomas Jefferson adapted his earlier Virginia Statute for Religious Freedom into the First Amendment to the United States Constitution, enshrining a separation of church and state to support religious pluralism.

The rise of Protestantism contributed to the conceptualization of human capital, development of Protestant work ethic, a new work ethic, the European state system, modern capitalism in Northern Europe, and overall economic growth. However, urbanization and industrialisation created a plethora of new social problems. In Europe and North America, both Protestants and Catholics provided massive aid to the poor, supported family welfare, and offered medicine and education.

During the French Revolution, Jefferson co-authored the 1789 Declaration of the Rights of Man and of the Citizen recognizing freedom of religion. It did not prevent radical revolutionaries from violently seeking the Dechristianization of France during the French Revolution leading the Eastern Orthodox Church to reject Enlightenment ideas as too dangerous to embrace.

Nineteenth and twentieth centuries

The Second Great Awakening - a religious revival of the 1800s–1830s - produced Latter Day Saint movement, Mormonism, Restoration Movement, Restorationism, and the Holiness movement. Mormons preached the restoration of first-century Christianity, upheld millennialism and premillennialism, and sought to create a religious utopia. Restorationists, such as the Churches of Christ, Jehovah's Witnesses, and Seventh-day Adventist Church, Seventh Day Adventists, also focused on restoring practices of the early church, emphasizing biblical authority and baptism as the crucial conversion experience. The Holiness movement contributed to the development of Pentecostalism by combining Restorationism with the goal of Sanctification in Christianity, sanctification defined as a deeper spiritual experience.

This revival focused on evidencing conversion through active moral reform in areas such as women's rights, Temperance movement, temperance, literacy, and Abolitionism, the abolition of slavery. The pursuit of women's rights established "prayer, worship, and biblical exegesis as weapons of political warfare", while the accent on human choice and activism influenced Evangelicalism in the United States, evangelicalism thereafter. The 300-year-old trans-Atlantic slave trade, in which some Christians had participated, had always garnered moral objections, and by the eighteenth century, individual Quakers, Methodists, Presbyterians, and Baptists began a written campaign against it. Congregations led by black preachers kept abolitionism alive into the early nineteenth century when some American Protestants organized the first American Anti-Slavery Society, anti-slavery societies. This ideological opposition eventually ended the trans-Atlantic slave trade, changing economic and human history on three continents.

The Third Great Awakening began in 1857 and took root throughout the world, especially in English-speaking countries, contributing to a surge of missionary zeal. Nineteenth-century Protestant missionaries, many of them women, played a significant role in shaping nations and societies. They translated the Bible into local languages, generating a written grammar, a lexicon of native traditions, and a dictionary of the local language. These were used to teach in missionary schools, resulting in the spread of literacy and indigenization. According to historian Lamin Sanneh, Protestant missionaries thus stimulated the "largest, most diverse and most vigorous movement of cultural renewal" in African history.

Liberal Christians embraced seventeenth-century rationalism, but its disregard of faith and ritual in maintaining Christianity led to its decline. Fundamentalist Christianity rose in the early 1900s as a reaction against Modernist Christianity, modern rationalism. By 1930, Protestant fundamentalism in America appeared to be dying. However, in the second half of the 1930s, a theology against liberalism that also included a reevaluation of Reformation teachings began uniting moderates of both sides.

The Roman Catholic Church became increasingly centralized, conservative, and focused on loyalty to the Pope. As Nazism rose, Pope Pius XI declared the irreconcilability of the Catholic position with totalitarian fascist states that placed the nation above God. Most leaders and members of the largest Protestant church in Germany, the German Evangelical Church, supported the Nazi Party when they came to power in 1933. About a third of German Protestants formed the Confessing Church which opposed Nazism; its members were harassed, arrested, and otherwise targeted. In Poland, Catholic priests were arrested and Nazi persecution of the Catholic Church in Poland, Polish priests and nuns were executed en masse.

Russian Orthodoxy

The Church reform of Peter the Great, church reform of Peter I of Russia in the early 1700s placed the Orthodox authorities under the control of the Emperor of Russia, emperor. Russian emperors continually involved the church in campaigns of russification, contributing to antisemitism. The Bolsheviks, communist revolutionaries who established the Soviet Union saw the Church as an enemy of the people and part of the monarchy. The communist Soviet Union heavily persecuted the Russian Orthodox Church, executing up to 8,000 people by 1922. The League of Militant Atheists adopted a five-year plan in 1932 "aimed at the total eradication of religion by 1937". Despite this, the Orthodox Church continued to contribute to theology and culture.

After World War II

Worldwide

Before 1945, about a third of the people in the world were Christians, and about 80% of them lived in Europe, Russia, and the Americas. In 2025, 31% of adults around the world declare themselves Christian, but they are no longer concentrated in the West. Christianity has been in decline in Europe for decades. Between 2010 and 2015, the number of European Christians who died outnumbered births by nearly 6 million. From 2019 to 2024, the Christian share of the adult population in the United States stayed between 60% and 64%. Even so, it is estimated that fewer than a quarter of the world's Christians will live in its western locations by 2060.

After WWII, decolonization strengthened the indigenization efforts of Christian missionaries, leading to explosive growth in the churches of former colonies. In 1900, there were just under nine million Christians in Africa; by 1960, this number had increased to 60 million, and by 2005, to 393 million, about half of the continent's population, a proportion which has remained constant as of 2022. According to Pew Research Center, PEW, religion is very important to people in Africa, the Middle East, South Asia, and Latin America where populations are growing and are likely to continue to grow. This is shifting the geographic center of Christianity to sub-Saharan Africa where more than forty percent of the world’s Christians are projected to live by 2060.

Christianity in Southeast and East Asia, especially Korea, grew faster after colonialism. Rapid expansion began in the 1980s. The Council on Foreign Relations reports that the number of Three-Self Patriotic Movement, Chinese Protestants has grown by an average of 10% annually since 1979, with growth especially prominent among young people.

With the Fall of the Eastern Bloc, Christianity expanded in some Eastern European countries while declining in others. Catholic countries have displayed secularization, while Orthodox countries have experienced a revival of church participation. Orthodox Christianity made a partial resurgence in the former Soviet Union after 1991 and continues to be an important element of national identity for many citizens there.

In the first quarter of the twenty-first century, Christianity is present in all seven continents and a multitude of different cultures. Most Christians live outside North America and Western Europe; white Christians are a global minority, and slightly over half of worldwide Christians are female. In 2017, PEW reported that Christianity is the world's largest religion with roughly 2.4 billion followers, equal to 31.2% of the world's population.

Modern movements

In the twentieth century, Christianity faced the challenges of secularism and a changing moral climate concerning sexual ethics, gender, and exclusivity, leading to a decline in church attendance in the West. In a 2018 PEW survey of 27 countries, the majority of nations had more residents claim that the role of religion has decreased over the preceding twenty years than said it had increased. However, people in Southeast Asia, Southeast Asian and Sub-Saharan Africa, Sub-Saharan African countries reported the opposite trend, suggesting that secularization is a region-specific trend.

In 2000, approximately one-quarter of all Christians worldwide were part of Pentecostalism and its associated movements. By 2025, Pentecostals are expected to constitute one-third of the nearly three billion Christians worldwide, making it the largest branch of Protestantism and fastest-growing Christian movement.

The three main branches of Eastern Christianity are the Eastern Orthodox Church, Oriental Orthodox Communion, and Eastern Catholic Church. Roughly half of Eastern Orthodox Christians live in formerly Eastern Bloc countries. Its oldest communities in Jerusalem, Antioch, Alexandria, Constantinople, and Georgia, are decreasing due to forced migration from religious persecution. In 2020, 57 countries had “very high” levels of government restrictions on religion, banning or giving preferential treatment to particular groups, prohibiting conversions, and limiting preaching. As of 2022, Christians were harassed in 166 countries, compared to Muslims in 148 and Jews in 90. Anti-Christian persecution has become a consistent human rights concern.

Orthodox Christians of the Greek, Russian and Balkans branches tend to be more conservative on most issues than Protestants and Catholics. Less than 40% of Orthodox Christians favor reconciliation with the Roman Catholic Church. Roman Catholic ecumenical goals are to re-establish full communion amongst all the various Christian churches, but there is no agreement amongst evangelicals. There is, however, a trend at the local level toward discussion, pulpit exchanges, and shared social action.

The multiple wars of the twentieth century brought questions of theodicy to the forefront. For the first time since the pre-Constantinian era, Christian pacifism became an alternative to war. The Holocaust forced many to realize that supersessionism, the belief that Christians had replaced the Jews as God's chosen people, can lead to hatred, ethnocentrism, and racism. Supersessionism was never an official doctrine or universally accepted, and supersessionist texts are increasingly challenged.

For theologians writing after 1945, theology became dependent on context. Liberation theology was combined with the social gospel, redefining social justice, and exposing institutionalized sin to aid Latin American poor, but its context limited its application in other environments. Different historical and socio-political situations produced black theology and feminist theology. Combining Christianity with questions of civil rights, aspects of the Black Power movement, and responses to black Muslims produced a black theology that spread to the United Kingdom and parts of Africa, confronting apartheid in South Africa. The feminist movement of the mid-twentieth century began with an anti-Christian ethos but soon developed an influential feminist theology dedicated to transforming churches and society. Feminist theology developed at the local level through movements such as the womanist theology of African-American women, the Ada Maria Isasi-Diaz, "mujerista" theology of Hispanic women, and Asian feminist theology.

In the mid to late 1990s, postcolonial theology emerged globally from multiple sources. It analyzes structures of power and ideology to recover what colonialism erased or suppressed in indigenous cultures.

Modern motivation toward missions has declined in some denominations. The missionary movement of the twenty-first century has become a multi-cultural, multi-faceted global network of NGOs, volunteer doctors, short-term student volunteers, and traditional long-term bilingual, bicultural professionals who focus on evangelism and local development.

See also

* Historical background of the New Testament
* Historicity of the Bible
* Jesus in Christianity
* Life of Jesus
* Timeline of the Roman Catholic Church

Notes

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External links

The following links give an overview of the history of Christianity:

''Historical Christianity: The Ancient Communal Faith''
Print, ebook, and audiobook

History of Christianity Reading Room:
Extensive online resources for the study of global church history (Tyndale Seminary).

''Dictionary of the History of Ideas''
Christianity in History

''Dictionary of the History of Ideas''
Church as an Institution

Sketches of Church History
From AD 33 to the Reformation by Rev. J. C Robertson, M.A., Canon of Canterbury
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A History of Christianity in 15 Objects
online series in association with Faculty of Theology, Uni. of Oxford from September 2011

The following links provide quantitative data related to Christianity and other major religions, including rates of adherence at different points in time:

American Religion Data Archive


A timeline with references to the descendants of the early church.


A short timeline of the Protestant Reformation.

Fourth-Century Christianity

{{Authority control

History of Christianity,
History of religion by religion