Shrek

I can't think of anything quite like Faith besides The Exorcist. Hereditary is the next closest thing off the top of my head, honestly I think it matches the vibe pretty good. I read an old novel from 1796 called The Monk (which was an inspiration for the game Blasphemous), if you can find a movie adaptation of that then it's probably similar (or read the book, it was good). It's kind of a stretch, but Twin Peaks: Fire Walk With me is surreal/mysterious and is about possession.

The one I saw recently that I found to be kind of similar was The Pope's Exorcist. It was super spooky or anything, a little campy at times, but it was fun and there are a few ties you can make with that movie and this game, besides the obvious "story about exorcism".

Not a horror movie, but "The Boondock Saints" has a similar vibe.

I unfortunately don’t have any recommendations, but I agree! Faith has potential to be an incredible movie and I would love to see that happen (though I doubt it ever will )

Hollywood hurry up and buy the movie rights, if Kingmakers is getting a movie I don't see why FAITH can't either.

Faith has the unique opportunity to be a game adaptation that actually would have zero issues translating itself because
1: The story is actually a good story on its own without gameplay
2: The game play can easily be translated to John exorcising the demons instead of just standing there with his laser beam cross.