They don't want to kill Muslims... just infidels. Seems terrorists aren't quite as squishy about religious equality as we are... that said, if you try to trick them they'll torture you for days before killing you. Best advice? Hide or run ... Well, just run.
If you stay informed on these matters, I suggest LONG WAR JOURNAL, this signified that it was Al Qaeda who was responsible. ISIS would have just killed everyone. Today Al Qaeda is trying to present itself as a more high brow sort of murderous jihadi outfit, in contrast to the more typical street thug ISIS type.