I'll answer your questions when you explain the premises in a way that makes any sense at all. So far you're proposing a scenario in which the US is devastated by stolen Soviet nuclear weapons, Muslims invade en masse and take over, and then within some time frame I'm somehow presented with the either/or choice of decapitation or conversion. Oh, and part of the only solution to this is to line Muslim children you deem orthodox along a ditch and put a .380 slug into the base of their skulls. Maybe you live in a world of paranoid delusions where Al Qaeda's building landing crafts to invade a post-nuclear hellscape USA, but I don't. You may as well ask me what I'm going to do when dogs start talking and ally themselves with the martians.
But if you REALLY, REALLY believe this, then you're the coward, because you're not doing a thing about it.
Finally, I can't help but notice you're not answering my question. How many children do you think you can kill in an hour?