Book of Kells, Chi Rho folio, c. 800 · public domain

Christianity

Tradition·Founded 30 CE·est. ~2.4 billion worldwide

Judaism → Christianity → 11 branches

Branch

History & overview · every faith gets one

God became human, died under empire, and did not stay dead.

Faith in Jesus of Nazareth as the incarnation of God: crucified, risen, and returning. What began as a sect within Judaism became, within four centuries, the faith of the empire that executed its founder — today the largest religion on earth.

Jesus and the first communities

An itinerant teacher in Roman Judea announced the kingdom of God, gathered followers among fishermen and outcasts, and was executed as a rebel around 30 CE. His followers testified that he rose, and that testimony — not the ethics, which Judaism already held — became the founding claim. Paul of Tarsus carried the message to the gentiles, and within a generation the sect had communities around the eastern Mediterranean, held together by letters, shared meals, and a book still being written.

From persecution to empire

For three centuries Christians were an intermittently persecuted minority; then Constantine legalized the faith in 313, and by century's end it was the empire's religion. The councils — Nicaea above all — hammered doctrine into creeds: one God in three persons, Christ fully divine and fully human. The faith of the executed founder became the faith of the executing state, a tension the tradition has argued with ever since.

The great divisions

The church divided along the lines of the empire that carried it: East and West drifted for centuries and formally split in 1054 over authority and a single word in the creed. Five hundred years later Luther's protest against indulgences broke the Western church itself; the Reformation's principle — scripture over hierarchy — proved endlessly divisible, and Protestantism became a family of families. Catholic, Orthodox, and Protestant remain the three great branches, with ancient Oriental churches beside them.

Texts and worship

The Bible binds Jewish scripture (the Old Testament) to the gospels and letters of the New — one story read as promise and fulfillment. Worship centers on word and sacrament: the reading and preaching of scripture, and the meal — Eucharist, Mass, communion — that reenacts the founder's last supper. What that meal is has been one of the tradition's sharpest internal arguments.

The modern era

Christianity is the largest religion on earth — roughly 2.4 billion people — and its center of gravity has moved decisively south: the typical Christian today is more likely in Lagos or São Paulo than in Rome or Geneva. Pentecostalism, barely a century old, is its fastest-growing current, while the old churches of Europe empty and the argument between literal and liberal readings runs through every branch.

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