Religion has become such a touchy controversial thing lately that having it in a film causes people to practically riot and petition and sue for whatever injustice that feel they are experiencing for having different beliefs then their own displayed especially when God or religious individuals are the heroes of the film.
To be fair, religious fanatics do the same thing with movies they find evil, immoral and against God despite once again just displaying a different belief system or by not including God.
Because of how sensitive the issues become, religion isnt being used in horror films as much and instead we have regular individuals defeating the ghost/demon/etc using research, some kind of strange ability like in Insidious, through their own sheer will or through the ghosts own backstory.
This of course leaves viewers with a feeling that even a regular Joe like them can defeat a powerful evil spirit which is actually a good message.
However I still think religion is needed for exorcism movies.
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