Then like locust storms, repeat the same manoeuvre at all other none christian religious gatherings, even down at the ganges river where the religious bathing festival occurs, stuff like that. Should be able to shoot a few dozen million here and there ? It would lessen the none authorised religiousness going on in the world and send a message out, that you don't need either drones or jet power from the skies or troops on the ground, just flying Mohameds with machine guns.
A second wave of firepower could be in the form of 5 million really fit women in bathing suits toting rocket launchers, again with jetpacks, to go after ISIS directly, hiding in their odd small enclaves.