It doesn't really matter much if they would REALLY be dead or not.
Religions have an odd proclivity to find loopholes in such things.
They have an exceptional ability to be deaf to logic.
Example 1: The sun spinning around the Earth, even after mathematically proven wrong.
Example 2: Westboro Baptists, the hick inbred Christian (if you can really call them that) of the terrorists.
So an Imam just has to say that Allah tells him that you're in heaven when frozen, or dead ,or some other BS, and the terrorists believe him, and keep fighting, and that's the end of that.
Good try though...
Now how about this, MAD (mutually assured destruction) without the "M". So just, assured destruction. Oh, wait, that only works with ppl who want to live.
Ahh, here's an immoral idea, we come up with an airborne agent that gives people amnesia. Then, we deploy it over the entire middle east, and tell them all that they were affected by some sort of radiation or something from some sort of asteroid fragment in Mecca. Then we tell them that they're nice people, who don't have any sectarian divisions at all, who are athiests, or christians or bhuddists, or for the ultimate in irony...JEWS.
Discuss