No they won’t get it all. They look powerful and all willing to die for their cause but there are many forces against them in this world. There will always be a remnant even if they appear to triumph in worldly terms.
I wish I shared your confidence, friend.
It's not that Mohammedans are powerful, but that they are so numerous. And this is due, as you are certainly aware, to their rejection—and “our” eager embrace of—contraception. The math is simply in their favor. And once we're outnumbered, there's precious little we can do about it.