A lot of the things you have put in are not needed as in general with a religion most things default to not being enabled so specifying not to enable them is pointless eg: allow_viking_invasion, autocephaly and divine_blood all default to no whilst something like allow_in_ruler_designer defaults to yes. Specifying them again is not needed.
Also you have enabled some things in that religion which are not at all supported in the actual mod and I am not sure how well (if at all) they will work. For example can_call_crusade, can_grant_invasion_cb, can_have_antipopes, uses_decadence and uses_jizya_tax are not used by us at all and likely will not have support in the mod.
Also some which are not correctly used like expel_modifier and intermarry are not done in the way you have used them, expel modifier is only used if the religion can be expelled and it is a modifier about that religion not a different one and intermarry defines a religion or religion group with christian_catholic being a weird combination you have made of one of each from vanilla, not even this mod.
As Zerofighter said check out some of our religions to see examples
Also you have enabled some things in that religion which are not at all supported in the actual mod and I am not sure how well (if at all) they will work. For example can_call_crusade, can_grant_invasion_cb, can_have_antipopes, uses_decadence and uses_jizya_tax are not used by us at all and likely will not have support in the mod.
Also some which are not correctly used like expel_modifier and intermarry are not done in the way you have used them, expel modifier is only used if the religion can be expelled and it is a modifier about that religion not a different one and intermarry defines a religion or religion group with christian_catholic being a weird combination you have made of one of each from vanilla, not even this mod.
As Zerofighter said check out some of our religions to see examples