What follows will presume knowledge of the first six books, so those who have not made it so far should perhaps take this opportunity to retreat. And those who have managed altogether to escape being drawn into the Potter vortex will find nothing to entertain them here, so, with a heart full of pity, I bid such folks farewell for now....Rusell Arben Fox has written thoughtfully about these matters, and he calls our attention to comments that Joanne Rowling has made about her own religious beliefs. I'll close with her words. "Every time I've been asked if I believe in God, I've said yes, because I do, but no one ever really has gone any more deeply into it than that, and I have to say that does suit me, because if I talk too freely about that I think the intelligent reader, whether 10 or 60, will be able to guess what's coming in the books. … This [talking about religion] is so frustrating. Again, there is so much I would like to say, and come back when I've written book seven. But then maybe you won't need to even say it because you'll have found it out anyway. You'll have read it."
Read up on the mysterious R.A.B., the ambiguity of Snape, the identity of the Horcruxes, and the question of Harry's fate.
