I saw this movie the other night and WOW it was really, really good. It was 100x better than I thought it would be.
Seriously, there hasn't been any good movies for quite a while (even the academy award nominations weren't all that good)..so I didn't have very high hopes for this one..especially since it came from the Hellblazer comics (which I enjoyed).
However, I was very pleasantly surprised and the movie was great. Great story, awesome effects, etc.
And yes, it was very "churchy" but it wasn't preachy lame churchy, it was cool church stuff. It didn't come off incredibly preachy to me, however there were a couple parts that one might take as preaching (Such as, All you humans have to do is repent and god will take you into his bosom.. (Paraphrasing, I can't remember the direct quote).
Great movie, definetly go see it. It's very action oriented, with lots of cool effects and a great story. The acting was also pretty good. Sure Keanu Reeves is usually pretty wooden, but this time it fits the character quite well.
The character of Jim Constantine is a badmouth, chainsmoking, badass who is only exorcizing demons to secure a place in heaven (since he's doomed to go to hell).
Anyways, go check it out!