The Christian fight with Muslims was never based on race, but religion. Had the Turks or Arabs agreed to convert to Christianity, history would have taken quite a different course.
As if to demonstrate the preceding point, the Spanish monarchs did indeed expel some of their Jews, but only after trying to force them to convert. Only Jews who refused to convert to Christianity were expelled by the Alhambra decree of 1492. But the grounds were never racial, only religious.