It is undeniable that biblical mythology was affected by other cultures (especially Genesis for example). But other than that you have no idea what you're talking about. What books have you read about this? And by which scholars?
>Early Christian versions of Jesus were basically copies of Eros, and Late Christian versions of Jesus were basically copies of Zeus, and then in the middle ages everyone got depressed so they turned him into a holocaust survivor on a wooden plank.
This claim is just simply false. I challenge you to present a single work that you have read by a professor of Classics, New Testament, Theology, or Ancient history that argues that.