Judaism predated Christianity by 2 to 4 thousand years, depending on which sources you go by. That is why the Hebrew Testament comes first in the bible ahead of the Christian Testament. Jesus himself was a Jew, through and through.
@"liquid Snake", solly, but "gods" were worshiped for thousands of years before Abraham came along. Even in Genesis, "god" was referred to as the Elohim, the sons of El. The Elohim evolved into Yahweh over time from there.
Blessings on your Journey!