This link will take you to a series of videos by this respected New Testament scholar.
Was Jesus really born in a cave? And was that a cave a reference to existing pagan myths about the birth of god-men or other images? If you are interested in the supposed pagan connections to Jesus, you may appreciate Craig Keener’s article in the Journal of Greco-Roman Christianity and Judaism called The Nativity Cave and Gentile Myths.
People doubting the existence of Jesus is persistent theory that just does not seem to want to go away. Is there any evidence for the existence of Jesus? New Testament scholar Craig Keener wrote a piece on this topic for the Huffington Post. You can find the article here. If you are interested in more of what Craig Keener has to say about the historical Jesus, click on the following book.