No religion is "ideologically pure." Every single one, for its entire history, has been stealing from, fleeing from, responding to, accepting, and rejecting, ideas from its ideological neighbors.
This shaping of identity by selectively incorporating and rejecting ideas from Othered groups is, in fact, one of the major instrumentalities of religion.
FAKE RELIGION: 19th century reconstructionist religions based on chronologically diffuse fragments from various unrelated northern european peoples that got steamrolled by the Roman empire
FAKE RELIGION: 1st-7th century abrahamic religions based on chronologically diffuse fragments from various near eastern temple cults that also got steamrolled by the Roman empire.
REAL RELIGION: australopithecus born on an island and never learned to speak language or saw another human being because their mother died in childbirth and they survived on mole milk and was therefore able to think in pre-linguistic ideologically-isolated pure concepts making a clay figurine of her own penis.























