He's right. And in another generation, when by sheer numbers due to procreation the Muslims overtake us, we will wish we would have taken the command to "be fruitful and multiply" serious. I only had two children. I believed a lie. If I were to do it over again, i would have had more. Too late now.
Fear not. The Muslims evidently do obey this commandment, therefore they are apparently more godly than we, therefore they are favored by God. By letting the Muslims win, we therefore will have satisfied the will of God. QED.