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CK3 - Can heresies occur in any religion, or are they limited to Christianity?

I'm on my fifth playthrough of the game, 597 hours in total. The first four playthroughs were as various Pagan and Muslim faiths. I never once saw anything about a heresy appear in game.

This time around I decided to start as a Catholic and establish a new Christian faith. I've already been given two separate prompts asking me if I want to convert to the Cathar heresy, and then later my new Christian faith was declared a heresy and about six random rulers throughout Europe decided to convert to my faith without any input from me.

Seems like heresies are a big deal when you start as a European Catholic but I had no idea they even existed before this. I tried reading up on it and it seems like heresies occur when Fervor is too low.

Does anyone know if heresies can occur in other religions? I usually don't pay close attention to Fervor, so I'm not sure if it's a Christian-exclusive mechanic, or if Catholicism just happens to be one of the only faiths with such a swingy Fervor score.

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