It is not even necessary to think of it like that. Judeo-Christians (including Mormons) and Muslims claim to worship the god of the same figure called Abraham/Ibrahim of Canaan, who had sons named Isaac and Ishmael/Ismail. According to the Judeo-Christians, Isaac had a son named Jacob whose sons formed the twelve tribes of Israel, while according to Islam, Ishmael/Ismail was the ancestor of Muhammad.