Greater is He who is in me than he who is in the world...

Rating: 6/10 (18 October 2009)

Well acted, delivered, believable and somewhat disturbing.
Disturbing because this kind of movie reverses the hierarchy of good and evil and reinforces the fear many people have of demonic forces while reducing (in the minds of such people) the power God has over these forces.
In simple terms, I see this kind of film as an opportunity to illustrate that the "bad guy" in this movie has no power over the those who have invited the "good guy" into their hearts (and houses). Many other movies use a similar theme of demonic forces effortlessly being able to reach us in the physical world. Usually, such movies require a certain suspension of belief -- enough to inform us that we're seeing a product of a creative storyteller. Paranormal strokes our belief system just enough to make us suspect that if we were to all film our house at night, we might be in for a nasty surprise.
This also rates a disturbing because not once did Katie seek church assistance (not exorcism)...not even as an unbeliever. There could have been a little back story to her faith or lack thereof, since this had supposedly started when she was 8 years old. Of course, the story would have ended right there had she received the proper guidance!
***************POSSIBLE SPOILER******************
Near the end, you know what will happen next, and you may think you know how it will happen. You don't.