That is another good question.
And yes in terms of Ibraheem (Abraham) we believe he had two sons who were Prophets of Allah. One being Isma'eel (Ishmael) and Ishaaq (Isaac)
As for Prophet Ishmael he was a direct descendant of the Prophet Muhammad. However, he is not considered to be the father of the Arabs. Actually, he is considered an Arabized Arab, one who settled within Arabia and learned the language. The original Arabs were from Yemen and when they settled in Makkah Isma'eel learnt their language and married from their women.
Therefore, many of the Arabs who accepted Islam and practiced it during the time of the Prophet were not descendants of Ishmael. From the Prophet's companions there were those who were descendants of the children of Israel, those who were Roman, those who were Persian, those who were Ethiopian etc.
Additionally, there were from the children of Ishmael who fought the Prophet and some who never accepted Islam at all. Although many of them accepted Islam at the end of the day.
The purpose of me writing this is really to clarify that Islam is not an Arab tribal religion based upon lineage as there were those in the Prophet's time who were not Arab and there were Arabs who did not trace their lineage back to Ishmael.
As for Judaism someone has to be born a Jew to be considered as one hence it is hinged more on lineage rather than practice. And there are different theories as to who is a Jew and you can check it out on this website:
http://www.jewfaq.org/whoisjew.htm
Therefore, to claim that Abraham, Isaac, Moses, Jacob etc were all Jews is incorrect. Rather Moses, Jesus and the other Prophets from the descendants of Jacob are from the children of Israel (although
tribally Jesus was a Jew since he was a descendant of Yahooda who was one of the sons of Jacob)
At the end of the day, whether the Prophets were from the children of Ishmael or the children of Isaac
they all practiced one religion which is the religion of monotheism, the worship of the Lord of the heavens and the earth without any partner.
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