The show is in no way anti-christian. It takes a lot of influence from those sorts of mythologies, with the circles of hell and imps, even cherubs, and a brief glimpse of heaven(?) in one episode. It is simply showing the bad side of humanity, and sin, but not necessarily glorifying it. I think that it is a well-written show, with excellent animation, and it is clear there was a lot of research done for it. (For example, Stolas's Design). I can see why people may be uncomfortable watching it, because of the Cursing, Violence, and Explicit Humor, but overall, the show itself isn't bad.