Since EB wants to be realistic and historical correct why would you need a temple? You can't build more then one temple because it would probably unbalance the game as long as temples give important public order bonuses. But I think there's no doubt that a city would have temples for many important gods. It would be unrealistic to have it the way it is in vanilla.

(No English is not my first language, most times I just hope that the people understand the meaning of what I write. They often enough don't when I speak german...)