You people are right royally fücked. Even if your arguments weren't morally repugnant, and they are, there is no logical basis for your solutions.
Okay, so step #1 is closing down all the Mosques in the US. What next? You would have no choice but to make Islam illegal (or they'll just meet behind closed doors and REALLY plot against you) and then begin to arrest anyone who even mentions Allah's name. Next, because you have 1.5 million Muslims in the US (nice try, JP, but you know damn well what I meant by 'creating' them) you're going to have, oh let's guess, 10% of them behind bars within the year. That's 150,000 more prisoners than you already have. (Let's remember that the US is #1 in the world for per-capita incarceration.) Or, you'll have to ship them all out which will be a drain on the INS and local law enforcement and cost how many millions of dollars?
In the meantime, you've mainstreamed mass hatred of an entire class of people while causing this class of people to feel oppressed. For a close-up of what happens to people when they feel oppressed I would invite you to have a wee review of any one of the following moments in history: the American civil rights movement, the French Revolution, South African apartheid, the surge of the Evangelical movement, the current uprisings in Iraq and Ukraine, as examples. People don't tend to sit idly by while their people are being persecuted.
Everything you say now about Muslims (and you paint them all with the same brush because, as Game basically says, it's better to be safe than sorry) will become true. They will backlash -- as would you, as are the Evangelicals, as are the Sunnis and Shias in Iraq -- because they will ALL now, officially, hate you. You will drive the average Muslim (and if the ones I know are indeed average, these are peacable people) into the arms of the extremists.
After all is said and done you will imprison these people for the crime of being Muslim. If this strikes you as being perfectly okay, then you have just reduced yourself to the ranks of McCarthy's Pool Boy. Enjoy your hate-filled lives.