Dec 11, 2018 - How to Destroy a Secret Religion It is recommended you be an independent ruler to do this. It is not required, but it does make it easier.
Hellenistic Religion Crusader Kings 2
Not everyone agrees to fight against the pope.If you're a catholic character and your relations with the pope aren't too well, you can consider appointing the antipope, who is your own candidate for the head of the Church. To do so, you have to fullfill few terms: have a right of free investiture, 500 prestige points to spend and find the priest who'll agree to become an usurper (he has to like you more than the actual pope). Only when you complete all those criterions, you can nominate the antipope (screen above). Vatican is rich, so that they can afford expensive mercenaries.What profits are brought up with the antipope?
First of all, he is much more submissive than the actual pope so it's easier to persuade him to the divorce or excommunication. The crucial is fast that after nomination only antipope can exclude your subordinates from the Church, because they're no longer subjects of the real pope. It let you on freely operating with the excommunicate in your domain and protecting it from the legal Church. Wars with the popes are fought alone. Catholic rulers will then fear excommunication and they'll disregard an alliance with the player.Antipope means also problems; legal Father of the Church won't be happy that he has a rival, so he can declare war or even a crusade against the usurper.
Crusader Kings 2 Convert Religion
Another issue is fact that the kingdom with the antipope won't be trusted by the catholic rulers. Luckily, you can solve this problem. You just need to attack the pope and after winning place your antipope in the Rome. In such way you can move back to the Church with very favorable, new holy father.