Greeks, Celts, Norse, Egyptians, Judeo-Christians, Hindus and the Mayan. I can tell you're not a Greek, but you'll have to find the rest for yourself. As for not working with them, I highly doubt you'll get a complete exemption, but there are those who choose to ally themselves with other groups. I happen to employ Baldr of the Norse as one of my primary advisors.

As for who we fight... Mostly those who don't like the fact that we exist. We've been attacked before, and we've been lucky those haven't resulted in more damage than they have. But there are supernatural opponents that occasionally appear as well. I admit to having one of the bigger targets painted on me, but I have the army and treasury necessary to back myself up.

Keep yourself out of trouble with the anti-godling factions, and you should be all right.