This probably takes a bit of the wind out of the idea... But I think the idea of implementing the Reformation creates a few problems... so it might be done a little simpler.
An event, which causes Civs to choose between Reformed Christianity, or not. The ones that choose yes to the Reformation get a +3 with the other Reformers, and a -2 with the non-reformers. Have the civs which went Protestant more likely to choose Reformed than not. Percentages would be, I would guess Netherlands 85%, Germany 75%, Vikings, England 65%, France 35%, Spain 35%, Rome 15%, etc.
An alternative would be a mod where Religious splits were catered for in depth. From relatively benign ones, for example Karaite and Rabbinic Judaism, to the Protestant reformation...
An event, which causes Civs to choose between Reformed Christianity, or not. The ones that choose yes to the Reformation get a +3 with the other Reformers, and a -2 with the non-reformers. Have the civs which went Protestant more likely to choose Reformed than not. Percentages would be, I would guess Netherlands 85%, Germany 75%, Vikings, England 65%, France 35%, Spain 35%, Rome 15%, etc.
An alternative would be a mod where Religious splits were catered for in depth. From relatively benign ones, for example Karaite and Rabbinic Judaism, to the Protestant reformation...