I've been doing some thinking on the magic system for my fantasy world, and I've started bouncing around the idea of magic given to people by their gods. Regular prayer to a god would ensure that a person keeps their magic. But the snag I'm hitting is that I have a few different religions in my world, each with its own god/gods. But I also wanted to keep the gods' actual existence vague, instead of outright saying that any of them are real or not. I'm willing to scrap the entire idea if I need to, but how could I make a religion based magic system work if not everyone has the same god?