>Nobody fights wars over religion or racial hatred. They fight wars
>over economics, and use religion and race to drum up the populace.
Well, if that's what they use to drum up the populace, then it sounds like the populace, or at least some of it, is indeed fighting over religion and race.
>But no matter how fanatic your religion or racial creed, you can't
>physically take an armored battalion across 3,000 miles of howling
>wilderness with no way to feed, fuel, or fix the tanks.
You don't have to have a tank battalion to fight. Think more like Janjaweed militia on both sides. The Islamic fellahin dug in to defend the village (Green 1 leader with Yellow 2 followers, high motivation) against the marauding Sikh herdsmen who object to the loss of their carefully terraformed grasslands (mostly Blue 2's, medium motivation).