From ESV Bible: 1 Corinthians 15:14 (Paul’s letter to the Corinthians):

14. And if Christ has not been raised, then our preaching is in vain and your faith is in vain.

Four propositions undercut the entire foundations of Christianity—THE BELIEF THAT JESUS HAD LITERALLY RISEN FROM A GRAVE:

1. Jesus’ resurrection from the dead involved the resuscitation of his corpse.
2. All statements in the New Testament and other early Christian literature about Jesus’ resurrection are statements of faith, not reports of an historical event.
3. Jesus’ body decayed.
4. Somebody stole the body and disposed of it.
5. His followers lied about his resurrection after he died.
6. Belief in Jesus’ resurrection does not depend on what happened to his body.

Therefore, because nobody living can ever know what really happened to Jesus' body, if there was indeed a man who did die on a cross that came to be called Jesus, it is very likely that the Christian faith is in vain.

Moreover, these differing narratives of Easter in the later Gospels cannot be harmonized to produce a consistent story. They contradict each other too much. It’s clear that the physical resurrection of Jesus on Easter Sunday is a fictional evolution arising a good half-century after Jesus’ death. It is impossible any longer to accept such a miraculous event.

~ Professor Thomas Shehan