Re: Gods had nothing to do with Troy and Sparta . . . ?
Troy was an economical war, if I remember the history lessons (wheat) and Sparta against Athens was a matter of military concept and influence, I believe.
With polytheism, it wasn't possible to involve gods as they either were good or bad and their moods changed and they were disagreeing with each other. If a town chose a specific god to protect them, it also is a kind of monotheism.
Raoul