I'm looking into the possibility making the mods new religions becoming their own religions in converted EU4 games.

If you have any suggestions regarding modifiers and appropriate mechanics please let me know. I cannot mix mechanics from different vanilla religions though.

Right now religions convert as follows:
-- Adoptionist --> Catholic
-- Barlaamite --> Orthodox
-- Judaizer --> Coptic
-- Chaldean --> Catholic
-- Mandean --> Zoroastrian
-- Free Spirits --> Catholic
-- Yarsan --> Shia
-- Apollinarian --> Coptic
Paradox had not updated the converter for the Qarmatian heresy, so I added a conversion table for it as well:
-- Qarmatian --> Shia