He Never Died (2015) had Henry Rollins playing an immortal cannibalistic weirdo, who is revealed to be Cain. This confused me a bit though, because near the beginning you see him without his shirt, and he has scars on his back that look like they were left there from where wings once were. So for most of the movie I was under the impression he was a fallen angel, then it kind of threw me for a loop when it was revealed his was the biblical Cain. I don't remember any stories of Cain becoming an angel or anything like that.

I have never seen that, but it sounds interesting. That reminds me a little of the book A Canticle for Leibowitz. There's a character in that who keeps showing up in different scenes, now and then, and then eventually we find out that he is Lazarus from the Bible. The idea was that if Jesus raised someone from the dead, that person STAS risen from the dead no matter what. Forever, apparently. He survived one nuclear war before the beginning of the book, and then possibly another one at the end. I can't remember if he survived the second one, actually, he might have died in that one, or possibly at some point in the book that I have forgotten. There was all kinds of biblical stuff going on that I don't think I understood very well, the author could have had Lazarus die for some reason, I guess. I'll have to go back and check.