There is a solution to ISIS. Not my idea but a brilliant one.
Their apocalyptic theory tells them they should expect a huge battle at a place called Dabiq in Syria. Their belief impels them to fight that fight.
It's a plain. Quite the place for a conventional battle. Room for tanks, aircraft sorties, drone runs etc.
So let's take on their prophecy and do battle there. If we win, that's the end of them. If they win, then they have a heck of a God and we'd best convert as quickly as possible!