[Note: please don't take facetious content seriously.] I think that Religion works quite well in Civ 4: creates happiness, priests boost production, can cause strife between civs etc. What I wasn't so pleased with was players talking about 'collecting' religions. And then there's all this creating money malarkey. You cannot serve God and mammon! I would say that generating a big pile of cash is not one of the most salient characteristics of religion, unless your name's Jimmy Swaggart. At the moment the religions work more like a commercial product - they basically make citizens happy and make money for the Man. Hmmm. What the game's religions are lacking is some sort of spiritual component. I suggest something like Faith, which would work something like this: 1) As soon as a religion spreads to a city, Faith starts accumulating there. 2) Priests still increase production but would now generate additional Faith, as would Great Prophets* when they settle in a city. 3) Relgious buildings also generate Faith, eg Monastery 1pt, Temple 2, Cathedral 4, Shrine 12. The Holy City obviously would too. 4) Some Wonders have an effect, eg Angkor Wat increases Priest's Faith generation rate. Effects of Faith 1) Faiths are religion-specific: the more Faith a city accumulates, the harder it becomes for other religions to spread there. 2) It should 'cost more' to have multiple religions in a city. For each additional religion in a city, there should be an increasing chance of Religious Conflict. This conflict would remove the happiness bonuses granted by the multiple religions. 3) In any city where there is no religious conflict, Faith provides a defensive bonus to units. This would have to be cumulative with the cultural bonus, which would be halved - thus providing more incentive to build Walls and Castles. 4) As Faith accumulates, it grants additional happiness bonuses as long as there's no conflict. 4) Faith would also affect the influence of different religions, and the strength of rivals' reactions to each other. *Great Prophets could have two additional effects: remove religious conflict, and convert non-state religious believers to the state religion. Both would affect an area rather than one city.