Oh when you're talking about art, sure. People and cultures tend to want to identify with Christ and so end up depicting him in a certain way. Of course we know that Jesus was a Jewish man who lived in the middle east, so he's surely not black or white or hispanic, etc..

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.