ISIS claims that their invasion is sponsored by Allah who is otherwise called YHWH.
ISIS is a theocracy led by a Caliph who is both its spiritual and temporal leader.
And that is precisely what ISIS is doing. Which is unsurprising when you remember that Mohammed lifted much of the Koran from the Old Testament. Which is why Jihad looks so much like the Israelite invasion of Canaan. But coincidence and 3000 years don't really get us off the hook because the Church routinely presents Moses and Joshua in heroic terms. If it turns out that "doing God's will God's way" is indistinguishable from the practices of the latest crazed sack of Jihadi Joes then it really calls into question just who this God that we spend so much time worshiping really is - is he "love" or not? Because say what you will, there was NO mercy in the conquest of Canaan. Scholars now estimate up to a million people lost their lives (this at a time when world population couldn't have been more than 150 to 200 million) due to the Israelite invasion and whole cultures were obliterated. Much like the Yazidis or Assyrian Christians in Iraq and Syria today.