There are many different things on demonology, evil spirits, etc but who knows for sure that they exist?
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I became interested in their work after watching the movie Conjuring 2. I did not know that they were real people from the 1st one. I like the belief in Faith to defeat the demons, however I did not find too many accounts where they defeated any.
I've never actually watched the Conjuring movies, but I've been reading about the Warrens and watching interviews about them since they were involved with the Amityville case in the 1970s. They make a lot of $ off the 'good vs. evil' hype.