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They can then spread it to other people in the same court. So, I created the Empire of Scandinavia after converting to Catholicism for lots of Casi Belli, but now I want the Absolute Cognatic Gender Law for succession, so after searching forever, I finally found a Cathar and married my Emperor to her. You cannot secretly convert to a heresy from a holy site, unless the heresy is the main faith that was supplanted i.e. When the event triggers to convert to a heresy I have an almost instant 50% moral authority at least with the holy sites I stole and at the same time destroyed the catholic moral authority. Islam has several mechanics not found in other religions and requires unique strategies. Muslim non-nomadic rulers are playable with the Sword of Islam DLC. 0% MA is not so bad, just kill all heretics. So I thought I could just convert that way (I converted from Norse to Catholic via my concubine), but I don't see any option to convert. Also, don't forget that catholics have (or will get) holy orders while the heresies don't (unless they become the majority religion but I've never seen THAT happen). Religion is core to how Crusader Kings II works. Heresy Expansion mod strives to give a more satisfying experience to playing heresies in Crusader Kings 2. As you can only play as christian characters (unless you bypass that limitation, some info on that later), this installment will be from a christian perspective. or kent if they aren't all ready within my realm. Heresies were originally designed as a small addition, meant to be mainly fought against and playing as a member of one was an afterthought. Muslims are followers of Islam, one of the 6 religious groups represented in Crusader Kings II. Also I got a learning theologian focus and it really helps.
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Invite diligent and zealous Cathar characters to your court - they have an event that can convert random courtiers to their religion (you can then choose to convert) Also, note that heresy in general spreads faster if moral authority of your religion is low. Generally, playing as a Muslim trades stability for better control of your traits and gene pool.
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