DEMONISM
diabolism, demonism, Satanism
(noun) a belief in and reverence for devils (especially Satan)
Source: WordNet® 3.1
Etymology
Noun
demonism (countable and uncountable, plural demonisms)
(uncountable) Belief in, or worship of demons or devils.
(uncountable) The quality of being demonic (often figuratively).
(countable) An act or event attributed to demons or devils; an evil act.
Anagrams
• medimnos, misnomed
Source: Wiktionary
De"mon*ism, n. Etym: [Cf. F. démonisme.]
Definition: The belief in demons or false gods.
The established theology of the heathen world . . . rested upon the
basis of demonism. Farmer.
Source: Webster’s Unabridged Dictionary 1913 Edition