We do not have any historical knowledge of who founded the Jewish faith. This is not something like Islam or the LDS (Mormon) Church that was founded in historical times by well-attested historical figures. Instead, the faith was founded thousands of years ago in a time and place in which no record was kept of its founding. According to the book of Genesis in the Bible, Judaism in its modern form started with Abraham. He was the first person to teach that there was only one God and God therefore chose Abraham to be the father of God’s people, the Jews.