Lets just say though, worst case scenario, and the US was deeply infiltrated by radicals and on some certain date they were all given the green light for a mass jihad war. Chaos littered everywhere, buildings blowing up, planes crashing and death in the street. Lets say there were a a large group of people being held captive with some line up with knives placed on their throats as the other hostages watch. Then one of these terrorist instructed for all Muslims being held captive to stand up and step to the side for their life will be spared. At that moment, Now Ahmed and Tom have been friends along time playing bball since middle school and their families have went on vacation together many times. Ahmed looks over at Tom as he is given this out because of his Muslim belief. What does he do? Well, if Ahmeds parents have taught him the Koran, then Ahmed will remember the text that speaks of infidels and of these rewards. Poor Tom is shit out of luck.
The point is, regardless where the Muslim is born and raised, if they truly follow their teachings, they know that everyone else are infidels and this alone is punishable by death.
This is certainly something to be aware of because if Ahmed wants your sammich, he may kill you for it.