Great system you have there. Of course, you would only catch the honest Muslims. I doubt Muhhamed Atta would have fallen for such a tactic.
And, of course, that provides no answer as to what you would do with American citizens (especially the native-born) who happen to be Muslim.
"And, of course, that provides no answer as to what you would do with American citizens (especially the native-born) who happen to be Muslim."
There is no good solution.
There are what, 2 million muslims here in America? It's impractical to deport them all. I think that this is a pressure cooker than can go one of two ways.
Senario #1. muslims continue to behave as if they are a country within a country. They adhere to their teachings, and treat infidels as non humans. Another attack or two in America, and there will be much bloodshed. Not something I want to see, just stating how I think it could go.
Senario #2. muslims in America need to adjust, and assimilate. Be American. Turn in the terrorists and radicals in their community. Embrace America, don't profess that anything less than an islamic theocracy in America is unacceptable.
I fear #1, but given what I know of islam and the koran, I see #2 as highly unlikely.