Forgive me if this has been asked before but how will other nations view your religious choices? For instance will there be a heavy diplomatic hit if they are of a different religion?
Will it work on a scale for example if you have different religions as the result of a schism will they be slightly reduced, or will it go the way of Northern Ireland and all out grrr?
As nations become more enlightened will religion become more of a back marker, a part of the cultural picture of your civ, not necessarily a focal point?
Also will it be possible to be both fundamentalist and scientifically developed?, yes Iran I'm looking at you here.
Again I apologise if you have dealt with these points previously.