Historians usually say Christianity started in the first century CE, as a Jewish movement that formed around the life, death, and resurrection faith in Jesus of Nazareth in Roman Judea.

The Short Answer

  • Christianity “began” as a distinct religious movement shortly after Jesus’ crucifixion, around 30–33 CE.
  • It emerged inside Judaism, in Jerusalem and the surrounding region, before gradually spreading through the Roman Empire.

Why the Date Is Tricky

Scholars and believers sometimes point to different “starting points” for when Christianity began:

  1. Birth of Jesus (around 4–6 BCE)
    • Some Christians see the incarnation (Jesus’ birth) as the theological beginning.
    • Historically, though, no organized Christian movement existed yet.
  1. Public ministry of Jesus (about 27–30 CE)
    • Jesus preached, gathered disciples, and announced the “kingdom of God.”
 * You could say the _message_ that would define Christianity starts here, but his followers were still a Jewish group, not yet a separate religion.
  1. After the crucifixion and belief in the resurrection (about 30–33 CE)
    • Jesus was executed in Jerusalem under Roman rule around 30–33 CE.
 * His followers soon claimed he had risen from the dead, began preaching that he was the Messiah and Lord, and formed communities centered on this belief.

 * Many historians mark this moment—resurrection faith and the first communities—as the historical “start” of Christianity.
  1. Spread to Gentiles and separation from Judaism (1st–2nd centuries)
    • At first, the Jesus movement was a Jewish sect.
 * As non‑Jews (Gentiles) joined and Jewish law was not required of them, the movement gradually became distinct from Judaism, especially in the 2nd century.

 * From this angle, Christianity “fully” becomes its own religion over time rather than on a single date.

A Simple Way to Remember It

If you want one practical line for “when did Christianity start,” you can say:

Christianity began in the 1st century CE, shortly after the death of Jesus, when his followers began preaching his resurrection and forming communities devoted to him.

That captures both the time (1st century) and the key event (faith in the risen Jesus) that most scholars see as the real beginning. Information gathered from public forums or data available on the internet and portrayed here.