I know exactly what you're talking about, Aporia, I ONLY play games that are stacked one way or another, usually against me. The biggest factor in creating a Good vs. Evil war is religion, Order vs. Ashen Veil, with the side benefit that Ashen Veil will also shoot the AC up and create all kinds of mayhem.
Playing as Good, I always always include the Sheim and the Clan of Embers, with a couple other Evils thrown in as well. Interestingly, I've found that the Clan is almost as likely to found Ashen Vel as the Sheim. I like a little randomness in my games, but beware if the Khazad or Ljosalfar turn up as a random civ for their stupid early religions.
Unless the Clan or the Sheim is unusually strong (they both tend to be underperformers in my games), I'll get to Order before they get to AV; in that case, I'll wait on the tech, researching elsewhere until it's time to return to Orders from Heaven. The trick is getting the timing right. You want THEM to found AV first, and then you need to give that religion a bit of a head start, because you can always spread Order crazy fast with the self-propagating Adepts, and you definitely don't want everybody adopting Order and turning GOOD on you.
Usually I mess up this timing. As another poster said, civs will jump on whatever religion enters their lands first, and with the civ balance already leaning Evil I'm a little slow in getting Order out to my neighbors. Before I know it, everybody's Ashen Veil, Hyborem is knocking on my door, Hell terrain is everywhere, and I'm fighting a heroic losing battle against Armageddon.
But, then again, that's exactly what I was looking for.
