Well, that's a bit problematic when considering the origins of the book, but I think I better dip out of this conversation here and now.
If anyone is curious what resources led me to this conclusion, I would recommend reading "Jesus Before the Gospels" by Bart D. Ehrman. He is much better versed on the subject and also has some great talks online.
I'm curious, have you also read "The Case for Christ" by Lee Stroebel?