That people can be possessed by bad spirits, demons, ghosts, the devil, the evil.
Do you believe the documented cases of exorcism were real cases of possessed persons? Or just persons that had a mental disorder?
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What we now know is mental illness people used to think was “demon” or “spirit” possession. We also used to think diseases were caused by spirits or demons as well. Now we know better (most of us). Count yourself lucky that you live in an age where you can get proper medical treatment from a doctor instead of having some witch doctor or priest spout mumbo jumbo at you.