Question:

Which of Noah's three sons did the Gentiles come through?

Answer:

All three sons. "Gentiles" means "nations" and was used for anyone who wasn't an Israelite (a descendant of Jacob). Abraham descended from Shem, but through Ishmael came the Arabs, and the Edomites came through Esau. Abraham's nephew, Lot, was the father of the Ammonites and Moabites. All these were Gentile nations, but they descended from the same son of Noah -- Shem.