This is purely my personal opinion about the movie. Plot-wise I believe the movie was not that strong. It wanted to portrait a person who did not believe in God, fighting against evil with God's powers. But the character development was too rushed that it wasn't highlighted properly. Also, regarding the 'thriller' factor. Maybe weak-hearted people like me will have a difficult time with the good sound effects and CG but I would only give 6/10 for the overall 'thrill-factor' in the movie since it wasn't that powerful compared to other thriller movies I have watched.