This seems like more or less just contemporary fiction to me, with slight paranormal. From your query, it reminds me a little of the Mortal Instruments, but obviously not as hard (does that even make sense)? In the way of hard vs soft sci-fi. I would say your best bet for reading in the genre would be to read things that have similar aged MCs. If this is helpful, a book that may be similar to yours with religious undertones would be We Were Saints by Han Nolan (I think). I read that many years ago but it might be worth checking out for you.

Good Luck!