It Really Happened

"If Jesus rose from the dead, then you have to accept all that he said; if he didn't rise from the dead, then why worry about any of what he said? The issue on which everything hangs is not whether or not you like his teaching but whether or not he rose from the dead."
— Timothy Keller (The Reason for God: Belief in an Age of Skepticism

Here are a good set of posts by Michael Patton summarizing the primary "internal" and "external" evidence for the resurrection.

internal evidence - within the biblical texts themselves:

• Honesty
• Irrelevant Details
• Harmony
• Public Extraordinary Claims
• Lack of Motivation for Fabrication

external evidence - support from outside the biblical texts:

• Preservation of the Documents
• Archeology
• Extra-biblical Attestation
• Survival in a Hostile Environment

HT: Between Two Worlds