If you're a religious person, in the broadest sense, you probably won't like this movie. If you're a catholic, this movie is pure blasphemy and made by the devil. And that's exactly what kevin smith has been cursed with by the many many protests against this movie: To make this movie, you must be the devil (or a member of his family), to hell with kevin smith.
From a more objective point of view, and not brainwashed by any religious preoccupation whatsoever, this is a funny movie where the principles of faith, the beliefs in a god, ...are turned upside down by two rebellious, upset and bored angels. Their motto: Heaven is hell, let's break out. What follows is a rollecoaster story with a bit of philosophy, a bit of romance, a bit of action, a lot of discussion, ... And a lot of fun.
First watch it, maybe enjoy it (maybe not) and then judge it.