Another question:

The question is: if each building has a +1 cultural spread, how many turns would it take for a settlement to be converted? I may have to limit the types of buildings that spread culture if it spreads too quickly. Any wonder would also have to generate culture, so that if you don't demolish a wonder it will generate resistance.

Also, before I even think about proceeding I need to know whether it's true or not that the first three religions are the only ones that have an effect on order (otherwise, why bother?).