Definition of devilism in English:
devilism
noun ˈdɛvɪlɪz(ə)mˈdɛv(ə)lɪz(ə)m
historical 1Action or conduct characteristic of a devil; devilishness; wickedness, evil.
2Worship of the Devil or devils; practices or rites thought to involve devils.
Origin
Mid 17th century; earliest use found in John Goodwin (?1594–1665), Independent minister. From devil + -ism.