heresy, unorthodoxy - a belief that rejects the orthodox tenets of a religion

theological doctrine, religious doctrine - the doctrine of a religious group

Mandaeanism, Mandeanism - a Gnostic religion originating the 2nd and 3rd centuries that believes John the Baptist was the Messiah and that incorporates Jewish and Christian elements into a framework of dualistic beliefs

aeon, eon - (Gnosticism) a divine power or nature emanating from the Supreme Being and playing various roles in the operation of the universe