​How can I write a proper religious character arc?

I’ve been writing this dark fantasy story for a while but I’ve been struggling on how i should go about writing a religious character arc for one of my characters for redemption purposes I want the character arc to feel realistic, actually mean something rather than the characters just being religious, and I don’t want it to feel like I’m “forcing religions beliefs” on the reader
So I was hoping someone can give me a few pointers on how I can execute the arc properly and if i can get some examples in media on how to do it