Its a death cult, if that can be called a religion.
But, all this takes is a constitutional Amendment: “Islam is not a religion under U.S. Law”
Once it is unprotected by the First Amendment, its teachings are criminal, its advocacy seditious, and its adherents organized crime participants.
This would be the worst case scenario on how to deal with Islam.
I would agree with this law if all peaceful ways of dealing with them fails. Which unfortunately means some nukes will have to be set off before that day comes.
At that point we could take over mecca and not allow any Muslims in Mecca. Officially by their own laws would make all Muslims Kafirs in a few generations. Which they can't change that law.
The peaceful way to deal with them would be to set new trade deals with Oil based countries to allow apostates to lave Islam. It would be a long term solution that would take many generations but it would work. As that trade deal is set up in Indonesia (in the late 60's) and 2 million Muslims are leaving per year.
I would not recommend messing with the Constitution in an effort to address Islam and the obvious contrary ideology from that expressed in our founding documents. Simple recognition of their law being opposite to our own should suffice. I personally refuse to accept them as a religion. Our founding elements were familiar with Christianity and what it was capable of in the hands of fallible man despite principles or commandments to the contrary. To consider any other comparison to prove a religion over criminal enterprise, or false ideology, would not be true to our founding IMHO.
That said, they would probably want to take it to the Suprmee Court. That might be interesting.