After reading Vergil, I couldn't help but notice many similarities between Jesus and Aeneas. I've also noticed similarities between Jesus and the plethora of other demigods throughout myth and history. I'm proposing the possibility that Jesus adapted Greco-Roman mythology for Judaism, but I have yet to find an answer to this question.
I'm a little confused by what you're saying. Are you suggesting that Jesus' story was fabricated by Jesus to match Greco-Roman mythology. I don't know of there being evidence of that; however, it is widely accepted that early Christianity evolved in part by adapting to various pagan traditions. The top link on this question covers that issue.