Very glad to know that you would deny me my rights as a citizen if some irish guy committed a terrorist act against the US. Oh shit, there was that Tim McVeigh guy. And there are Irish terrorists (Marxist to boot). Or maybe we should have rounded up all the white Christian militia types after OKC. What you are proposing is lunacy, not quite bad as the lunacy of the radical Islamists, but still reprehensible. So then what you are saying is that all Muslims are not radical. On the other hand, many people on this thread are saying that all Muslims are radical.
So its not a question of the constitution -- its a question of, are all Muslims radical?
I think it is obvious that not all muslims are radical.
But I won't disregard the constitutional question as easily as you will if I am reading your post there correctly. The Constitution is not something that should be disregarded when it is considered impractical.