It’s beyond heresy.

Well ok but this ONA has nothing to do with Christianity, they explicitly state it’s a militant Satanic left-hand path occultist network. I mean being Satanic kinda goes hand in hand with heresy.

As with many other occult organisations, the Order shrouds its history in “mystery and legend”, creating a “mythical narrative” for its origins and development. The ONA claims to be the descendant of pre-Christian pagan traditions which survived the Christianisation of Britain and were passed down from the Middle Ages onward in small groups or “temples”