The evidence is....Jesus promised to bring all the things he said to memory, This eliminates the oral transformation or "the telephone game effect" The oral tradition was perfect until all was written.
Jn 14:26-27
But the Helper, the Holy Spirit, whom the Father will send in My name, He will teach you all things, and bring to your remembrance all things that I said to you.
Read the opening post that addresses this misconception
What Extra-Biblical Sources Confirm
- Tacitus: The 2nd-century Roman historian recorded that Jesus suffered the extreme penalty under Pontius Pilate during the reign of Tiberius, and noted that the movement suppressed for a moment broke out again (referencing the rise of Christianity). [1, 2]
- Flavius Josephus: The 1st-century Jewish historian wrote in the Antiquities of the Jews that Jesus was a wise man, did surprising deeds, was condemned to the cross by Pilate, and that "he appeared to them alive again on the third day" (though scholars debate the exact phrasing of this passage, known as the Testimonium Flavianum).
- Jewish Authorities / Babylonian Talmud: Early opponent testimony did not deny that the tomb was empty or that Jesus's body was missing; instead, they attempted to account for it by claiming the disciples stole the body, providing indirect extra-biblical acknowledgment of the empty tomb.
Early Internal/Scholarly Evidences Cited by Historians
While not "secular" external proof, historians evaluate several very early shared data points:
- The 1 Corinthians 15 Creed: Dated by critical scholars to within 3 to 5 years (or up to a decade) of the crucifixion, recording an early confession of Jesus's death, burial, and post-mortem appearances to Peter, the 12 Apostles, and over 500 witnesses. [1, 2]
- Transformed Lives: The sudden, radical shift of skeptical or fearful figures—such as James the Just (Jesus's half-brother) and Paul of Tarsus—who claimed to have seen the resurrected Jesus and were martyred for their conviction. [1, 2, 3]
- The Birth of the Church: The rapid establishment and survival of the Christian movement in Jerusalem, the exact city where Jesus was publicly executed and buried, where opponents could have easily produced a body to crush the movement
There is no evidence that the original 4 gospels were circulated anonymously. This distinction belongs to the gnostic texts.
see Simon Gathercole's peer-reviewed article, The Alleged Anonymity of the Canonical Gospels
, published in the Journal of Theological Studies in 2018. Gathercole challenges the inference that the Gospels must have circulated anonymously simply because their authors do not name themselves within the texts.
The population at the time were largely illiterate and relied on word of mouth to pass things along.
The contradictory gospels are exactly what you'd expect from sources of the time.