The current religious modifiers have the AI behaving irrationally and somewhat weirdly. We can do better, without sacrificing roleplay elements. Here's my proposal: Same religion bonus We don't want to declare war on civs of the same religion because we will have extra unhappiness. If we have the same national religion with a civ, the following bonuses apply: +2 relations if 75% or more of our cities have our national religion +1 relations if 25-75% of our cities have our national religion +0 relations is 25% or less of our cities have our national religion There is no penalty for being a different religion, so Christian civs do not hate Muslims more than Pagans. Shrine income bonus We like civs that have a national religion that we have a shrine for, as they may spread the religion for us, and thus increase our shrine income. If they are of a different religion, then they may spread a competing religion and make it harder for us to spread ours. +2 relations if we control the shrine for the civ's national religion. -2 relations if someone else control the shrine for the civ's national religion. +0 relations if the civ has no national religion, or its religion has no shrine. Theocracy bonus/penalties We like theocratic civs if we have the relevant shrine, as it makes it easier for us to increase our shrine income. We dislike theocratic civs if we have other shrines, as we cannot increase their income. For a theocratic civ, the following bonuses/penalties apply: +2 relations if we control the shrine for the civ's national religion and can produce missionaries or monasteries for it. -2 relations for each other shrine we control for which we can produce missionaries or monasteries, up to a maximum of -8. The requirement to be able to build missionaries or monasteries handles the case when a civ captures a bunch of Hindu cities, including the shrine, after discovering Scientific Method. Apostolic Palace penalties If we are a member of the Apostolic Palace, we may end up in wars/embargoes with heathen civs. Therefore we don't value relations with heathen civs, as we could easily lose them. This is particularly true if we are outvoted and we have many cities that would get Apostolic unhappiness. A heathen civ is one with no cities that have the Apostolic religion. For those civs we have: -1 relations if we have less than 50% of the Apostolic votes -2 relations if we have less than 25% of the Apostolic votes These penalties are doubled if 50% or more of our cities contain the Apostolic religion. Personality and Strategy multipliers Double the effect of shrine-related religious modifers if we are running the missionary strategy. Multiply negative religious modifers by the leader's iDifferentReligionAttitudeSomething Multiply positive religious modifers by the leader's iSameReligionAttitudeSomething Normalise to make the total range between -8 and +8 Demands to change religion/civics The AI will demand a switch to/from Theology only if that would improve its relations with the civ. It gives a +1 modifier for changing civics if a civ incurs anarchy to do so. The AI will demand a religion switch only if that would improve its relations with the civ. It gives a +1 modifier for changing religions if a civ incurs anarchy to do so.