What is the religion in the Wizarding World? Do wizards follow Muggle religions like Christianity? Or do they simply not follow one? What about half-bloods? Do they abandon their religion upon entering the Wizarding World?

Also, how much do British people know about American religion? For instance, Mormanism is (I think) a primarily American religion. Do Brits know anything about this religion?

I'd love any thoughts you have on the subject!