You can't stop it. The south will submit the north.
>"One day, millions of men will leave the Southern Hemisphere to go to the Northern Hemisphere. And they will not go there as friends. Because they will go there to conquer it. And they will conquer it with their sons. The wombs of our women will give us victory." Houari Boumédienne>Christians and Jews were enslaved in large numbers. The first order for slaves, 3000 blonde virgins, was issued by the Caliph Al-Walid I. In 1189 the Almohad caliph, Yaqub al-Mansur captured 3,000 women and children and in 1191 the governor of Cordoba took 3,000 Christian slaves from the town of Silves.https://en.wikipedia.org/wiki/Al-Andalus 