Rook, I have seen your video here about Jesus Myth, and I have also seen "The God who wasn't there."
Have you considered the proofs of Jesus offered by John Shelby Spong. He is a very liberal Christian (he doesn't believe in a physical resurrection.) He offers several basic proofs that Jesus could not have been a myth in Jesus for the Non-Religious.
The first one I will point out is that Jesus came from Nazareth. The region of Galilee, where Nazareth resides, was a small, dirty, insignificant town of no notable distinction. Even people in the rest of Galilee looked down upon it. Phillip even asks Nathaniel in John 1 if "anything good can come out of Nazareth?" The town of Nazareth is referenced 28 times in the gospels and Acts.
The very fact that a Bethlehem birth tradition grew up around Jesus is additional testimony to the embarrassment that his roots in Nazareth caused to early Christians. The first written gospel of Mark has no birth narrative. Only in Matt/Luke do we have a Jesus born in Bethlehem. In all likelihood, the Bethlehem birth story is a myth to cover for the likelihood that Jesus was born in the second-rate town of Nazareth.
If Jesus himself was a myth, why would the mythmakers create a myth that would embarrass them?
"A man can no more diminish God's glory by refusing to worship Him than a lunatic can put out the sun by scribbling the word, 'darkness' on the walls of his cell." (CS Lewis)
"A young man who wishes to remain a sound atheist cannot be too careful of his reading." (CS Lewis)