And the other thought is kind of similar: Does the god gain more power the more worshipprs they have? If so then does that mean that the god is stronger (and thus any powers that derive from the gods, like a clerics spell-casting) where there are more worshippers? If this is the case, then one side-effect might be that clerics that go out adventuring, and entering enemy territory might find their powers lacking and their opponents be much more powerful). This would of course also have a large effect on which god was the most powerful in an area. The goddess dealing with fertility and growth of crops etc would probably be much more powerful than any upstart city-god...