Demonology

Goodness what a subject to try and explain. In very basic terms this is about researching demons and evil entities that supposedly inhabit our world at some point or another. Since time began man has in some shape or another depicted the negative or evil types of energies etc into a demonic type of generalisations. But it was when the church really took over it influenced many cultures even manipulated to an extent what we would perceive as demons and they installed that they were the devils spawn and all that type of stuff.
An interesting and brilliant subject to study whatever your religious affiliation.