Judaism is the religious culture of the Jewish People and is one of the world's oldest religions. Judaism makes up the cultural system of Jewish law, custom, and practice of the whole individual and community. It is a system in which everyone is under God's rule. Judaism originated in the Middle East and has spread throughout all parts of the world because of both voluntary migrations and forced exile or expulsions. The total world Jewish population is about 15 million, most of whom live in the United States, Israel, and the former Union of Soviet Socialist Republic.