Ancient Egypt and all of north Africa wasn't all white in antiquity, and wasn't entirely Christian, even during Roman/Byzantine rule, by the time the followers of the big ol' 'mo came in and burned the great library. The Jewish (actually Israelite) community in Djerba got started no later than 500 BC, and until the last couple of decades of jihad against them, culminating in Zero's Arab Spring, was still thriving. Jews thrived in the Roman Empire, in N Africa besides Djerba, they were a large minority in Alexandria. A now-deceased friend of years prior had a father who'd been born there.
I read an interesting piece in the WSJ a few years ago. The author’s family were Alexandrian Jews who didn’t feel compelled to leave until after Nasser’s thugs seized power and made clear they and others with non-Arab ancestry were not welcome in the new Egypt.