Either marry them or get them into your realm (as vassal or in court). Easier if you ‘re close to the religious border. Step 5: Click the “ Convert the Faith” button again.Step 4: Press the “ Convert the Faith” button.Step 3: Select the religion you want and click on it.Step 2: Click the “Other Faiths” button.How To Change Religion In Crusader Kings 3 How do you convert to Christianity in ck3? 12 How do I change my culture in Crusader Kings 2?.10 How do I change religion in Crusader Kings 2?.7 Can you make your own religion in ck2?.5 How do you call a good holy war in CK3?.1 How do you convert to Christianity in ck3?.