Jews believe in the One Creator who is God.
Avram was the first person in Jewish religion. He decided that the idols in his father's shop couldn't be real gods, so he started talking the one Creator of all: God. God told him that they could have a covenant, wherin Avram would take on a new name Avraham (or Abraham in English) and be the father to the Jewish people. He would also need to circumcise himself. He was 90 year old when he did this.
Avram was the first person in Jewish religion. He decided that the idols in his father's shop couldn't be real gods, so he started talking the one Creator of all: God. God told him that they could have a covenant, wherin Avram would take on a new name Avraham (or Abraham in English) and be the father to the Jewish people. He would also need to circumcise himself. He was 90 year old when he did this.