But this generic feature is already present in the form of a Crusade random event (right?) and the Apostolic Palace fueled religious wars. Perhaps one of these could be modded instead to fit the demand?The Crusade idea has merit, but it should be generic to fit into RFC. It could be something like: All civs with Religion X declares war on the civ controlling Shrine X(or holy city X), if that civ also has another religion than Religion X.
While I agree on Israel, the OP actually requested the historical Crusades as a part of RFC. Since I've created a scenario event scripting tool I was merely pointing out that it can be done. (It would of course be possible to do the mod scenario as regular Python code also. If anyone needs help - give a holler.)The historical Crusades were a total fiasco and doesn't deserve anything unique like Conquerors. It is a parentheses in history. So is Israel.
But sure, I agree that it shouldn't be a part of standard RFC - which it never will since there won't be any more patches. I wouldn't advice anyone of doing whatever mod scenarios they like by adding historical events to RFC though. If nothing else - its creative!