"Can't really recall the part in the Bible where Jesus calls on Christians to slaughter and subjugate non-Christians...or the Jews, for that matter."
Right, it probably comes from the Old Testament, notably Deuteronomy ch. 2-3. Lotta good slaughter of non-believers in there.
Hmm, if I recall correctly, the Ammonites (among others) had oppressed and attacked the Hebrews. Then God intervened to protect his chosen people, and they rose up and defeated their enemies.
I don't quite see God's chosen people advocating the mass slaughter of all if the infidels do not convert to Judaism. Nor do I see them - in the Old Testament, anyway - spreading their dominion beyond the territory of Israel that God set aside for them.
Look at the ideologoy of Judaism/Christianity as compared to Islam. Please don't compare them. They're not even close.