Another unfortunate consequence of the proliferation of superstitious dogma is the victims (including children) of exorcisms who are beaten, burned, tortured, and killed in an effort to extricate evil spirits.
The idea that there are invisible entities floating around, and inhabiting and controlling people, comes from religion (including Christianity). People who believe that they are being controlled by invisible beings are likely to be mentally unstable and may be psychotic. Religious folks who peddle this cockamamie baloney (including Christians) are morally culpable for the harm done.