demonism

Noun

 * 1)  Belief in, or worship of demons or devils.
 * 2) * 1699,, Of Virtue, and the Belief of a Deity, in An Inquiry Concerning Virtue in Two Discourses, London: A. Bell et al., p.10,
 * if he believes more of the prevalency of an ill designing Principle than of a good one, he is then more a Daemonist than he is a Theist, and may be called a Daemonist from the side to which the balance most inclines. ¶ All these sorts both of Daemonism, Polytheism, Atheism, and Theism, may be mixed
 * 1)  The quality of being demonic.
 * 2) * 1915,, letter to dated 22January, 1915 in  (ed.), The Letters of Henry James, London: Macmillan, Volume 2, p.453,
 * What a pitiful horror indeed must that desolation and desecration be—a baseness of demonism.
 * 1)  An act or event attributed to demons or devils; an evil act.
 * 1)  An act or event attributed to demons or devils; an evil act.
 * 1)  An act or event attributed to demons or devils; an evil act.
 * 1)  An act or event attributed to demons or devils; an evil act.

Etymology
..