Excellent movie! It is scary, but at the same time makes you seriously reflect on God's existence, atheism, and if there is something more waiting for your once your body rots away. It is a movie, but the subject it touches on is very important: Are you really sure hell doesn't exist? If not, do you really want to risk and end up going to hell? And if you aren't certain, what should you do about it?
With regards to its political messages (e.g., on abortion), only hypocrites will criticize that. After all, Hollywood movies do it all the time (take a look at Disney), but they choose to promote radical liberal ideology. So, the writers of this movie aren't really deviating from the norm in this respect.
Overall it is a great movie.