The real threat to America is that to stop the Islamic takeover, freedom of religion will be curtailed. Then watch what happens.
You have a point, but remember that "Freedom of Religion" in the Constitutional sense, means that the government cannot establish an official religion.
If we have another Muslim sponsored, 911 style attack in the U.S., it won't be the government, it will be the citizens who will make sure that Islam is no longer a threat to this country.