Names: Ending with -ism as is recommended on the new religion page, "Consider the name of your religion well - there is no way to change it later on. We recommend something with "ism" at the end."
By endorsing, I mean giving authoritative indications as to reality of player-religions theologies.
By religious overhaul, my old plans that I've long felt too overwhelmed to initiate. Religions more like realm governments than guilds, with proper power structures between members-as-a-whole and leaders with proper checks and balances between them and proper hierarchy (Bishoprics as equivalent to duchies - which would be a step closer to implementing religious schisms). Limited religions per continent. Joining a religion by default in new character creation and immigration, just like a realm. Being pagan being as abnormal as being rogue.