I hate to say this, but if this is the Marine in question, I think they'll do more than behead him. He might be in for some rough treatment beforehand. On the other hand, his being a Muslim might have a different outcome. He might get released, or else get treated 10 times as bad as a non-Muslim civilian. Who knows? I'd just as soon predict what a rabid dog would do than navigate the mind of these bloody savages.
Those bastards are rabid and there's only one way to treat rabies. They're miserable and they want to die. Give them whatever terrorist virgins are left.
If all anti-Americans would just shut up and leave us alone we could clean out that rat's nest a whole lot safer than we can now.