The Constitution is not a suicide pact and radical Islam is no more a religion than Communism or Naziism. When a religion becomes a front for an organization dedicated to the violent overthrow of the Constitution and the United States, then it ceases to be a religion as defined in the first amendment.
These people have one deep religious belief, they believe that Allah wants them to kill you and me.
"These people have one deep religious belief, they believe that Allah wants them to kill you and me."
They DON'T all feel that way, especially in this country. That kind of generalization is why Nazism happened.