If you didn't like it and you're a pagan, then that answers why. If you like it and you're a pagan, then that also answers why. If you're bothered by it and you're a pagan, then you might need to ask why you are a pagan in the first place. If you didn't like it and you're a "Christian", then you might need to evaluate the real meaning of that "Christian" word. If you like it and you're a "Christian", then this movie is not really for you. If you're bothered by it and you're a "Christian", then congrats now you know how worse the Adversary is, and you need to be very careful of which one whispers to you.
This movie is very basic, and as foolish as many will say that this is masking as a "Christian" movie, then they have a very different (a horridly shallow) meaning of "Christian"...this is toddler knowledge. I just liked the sense of its horror, and that's what it delivers as a movie.