Bart Ehrman, Robert Funk, Dale Martin, John Dominic Crossan, Mark Goodacre, Gerd Lüdemann, James Dunn, and the list goes on and on.
If books are not your thing, you can find a great Yale course about the subject here: New Testament History and Literature with Dale B. Martin: https://www.youtube.com/playlist?list=PL279CFA55C51E75E0
But you're original claim about the accounts about Jesus copying from Greek mythology, etc.. is just not viable historically.
I encourage you to delve into the literature actually it's quite fascinating! A good book to start with that I've enjoyed is Did Jesus Exist by Bart Ehrman.
I'll look into the sources you mention, though. I haven't gotten deep into the study of religions themselves but I'm sure I'll want to at some point.
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.