I think a better solution would be to tell them what we used to say when it was time to close the bar. "You don't have to go home, folks, but you can't stay here."
In the case of this obviously retrograde belief, why not just say, 'You don't have to give up Islam, but you can't practice it in our country.'
In other words, boogy on out of the country and find one that wants to commit suicide with you. Clearly we don't.
If all nations followed suit, the whole clan would eventually be isolated in one region where they would be able to finally destroy each other, no longer having access to the civilized world to get their human sacrifices.
In the short term, I agree. The best current course is to eject them all to their homelands to contain the threat.
Then, hopefully, the whole sorry lot would have a reformation or collapse under the weight of reality.
But if that does not happen, we will have to deal with this abomination sooner or later. And it scares me how far back in our evolution we will have to dig if we wait too long.