In the new Time, Lev Grossman has a short commentary lamenting the fading of God in the Potter series. True, there's no "Aslan," as in Narnia. But Narnia is far more allegorical by intention. It's apparent that Rowling has no such intention, and probably wants to avoid the theology. That doesn't mean the Power isn't there and isn't essential to the story. You won't find God in LOTR, either. More to be said about this after reading number seven. Can't wait until Friday.
By the way, I didn't know that Louis L'Amour wrote a medieval-themed novel. Found it at the big upscale chain bookstore over the weekend. It's called The Walking Drum. Something else to do.