exorcisms, the treatment of schizophrenia and other mental illnesses through rituals and the manipulation of the subconscious namely emotions.
poltergeists, the magical reminants of spells strong emotions and large libraries.
spiritualism, the simulation of the dead within skilled practitioners and the friends and family of the dead, just write a long will.gods, self fulfilling prophecies and actively cultivated mass hallucinations derived from biology, drugs, well understood concepts, the emotions and such tied to concepts as one experiences minor enlightenments.
possession, the transplant of personality, habits, education, memories, and potentially nerves and brain matter to another host.
spirits, much like the following things can be the result of sufficent information and complexity related to each meterial or concept. much like a god but often smaller in scope and hosted by animals insects and micro organisms.
the remainder are basicly just mixed versions of the above.
