This just goes to show the ridiculousness of Christianity
True, the priests in this movie may be perverting Christianity to their own version of it to gain full control, especially that guy with the glasses being the main persecutor, but with this kind of mindset, once someone is accused of devil possession, witchcraft or whatever else they can think of to get rid of an enemy, they simply don't stand a chance.
This is the sort of thing that makes me hate religion. It might bring peace to many, but it can be so easily misused to create this extreme paranoid environment as depicted here.