while muhammad was mostly arab he was 25% jewish as his grandmother was a jew also descendants of ishmael are arab and were rejected by the god of abraham and jews to be the "chosen people" and were cursed to wonder the deserts of arabia infact the word "arab" comes from the ancient hebrew word for "desert-dweller" after abraham sent ishmael to die in the desert. And the Muslim invaders of Iberia were let in by Jews at Toledo also jews helped the muslims earlier in alot of their conquests. The God of Islam is Both the God of Arabs and Jews who have a rocky relationship because at times it was at love or hate between the two.