A last drastic move would be to do exactly what this courageous Bishop suggests: Start shipping back those who won't behave in civilized fashion to their sand boxes of origin.
My guess is that would be one-third to two-thirds of them.
Administration of Loyalty Oaths would be a good start.
But would it matter? It could have the eventual benefit of utterly undermining the whole of the Mohammedan religion. Muslims could scarcely believe that Allah would allow one of the key pillars of Islam to be destroyed. Perhaps the best possible outcome might someday be to prove Islam false once and for all. The bulk of Muslims converting to something else --anything else-- would be a net benefit to the world at large. There are lots of dead religions in all of history. Maybe someday Islam will be one of them.