I would be interested in reading your answers to this question.
A recent post a John W. Loftus' blog got me to thinking about this topic. In the post, Loftus tells us that he asked Victor Reppert would it would take for him to give up Chrstianity. Reppert responded to him, saying, ". . .the skeptic, in my opinion, has not provided, nor has come close to providing, namely, a plausible naturalistic story about the founding of Christianity."
What is a Plausible Naturalistic Explanation for the Origin of Christianity?