Christianity is a branch of Judaism since it was created by the Jewish Messiah,Jesus,who taught every one of the Ten Commandments during His earth ministry which was limited by God only to the Jews.It was the Apostle Paul who took Jesus' teachings to non-Jews although he himself never gave up his Jewish faith.
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!