Ishmael saw his father Abraham making sacrifices to the God of the Ages. True neither of them were jews-no such tribe existed at the time.
Jacob was given the name Israel and his tewlve sons became the tribes of Israel. However, only the tribe of the eldest son survived in Palestine. The tribe of Judah.
And they became known as jews in the AD. Then mankind became either jews or gentiles. Later, Mohammad modified it, and mankind became infidels if they refused his doctrines.