I just had a thought...
If you discover a religion as the first one, then you get a city in which it grows from. What if you, as the first one, research them all or just two. Would these religions work against each other or what choices do you get?
If you discover a religion as the first one, then you get a city in which it grows from. What if you, as the first one, research them all or just two. Would these religions work against each other or what choices do you get?