 Judaism is the religion of the Jewish people. It is an ancient, monotheistic, Abrahamic religion with the Torah as its foundational text. 3. It encompasses the religion, philosophy, and culture of the Jewish people. Judaism is considered by religious Jews to be the expression of the covenant that God established with the children of Israel. Judaism encompasses a wide corpus of texts, practices, theological positions, and forms of organization. The Torah is part of the larger text known as the Tentnak or the Hebrew Bible, and supplemental oral tradition represented by later texts such as the Midrash and the Talmud. With between 14.5 and 17.4 million adherents worldwide, Judaism is the tenth largest religion in the world. Within Judaism there are a variety of movements, most of which emerged from Rabbinic Judaism, which holds that God revealed His laws and commandments to Moses on Mount Sinai in the form of both the written and oral Torah. Historically, this assertion was challenged by various groups such as the Sadducees and Hellenistic Judaism during the Second Temple period, the Carolites and Sabatians during the earlier and later Medieval period, and among segments of the modern non-Orthodox denominations. Modern branches of Judaism such as Humanistic Judaism may be non-theistic. Today, the largest Jewish religious movements are Orthodox Judaism Herezai Judaism and Modern Orthodox Judaism Conservative Judaism, and Reform Judaism. Similar sources of difference between these groups are their approaches to Jewish law, the authority of the Rabbinic tradition, and the significance of the state of Israel. Orthodox Judaism maintains that the Torah and Jewish law are divine in origin, eternal and unalterable, and that they should be strictly followed. Conservative and Reform Judaism are more liberal, with conservative Judaism generally promoting a more traditionalist interpretation of Judaism's requirements than Reform Judaism. A typical Reform position is that Jewish law should be viewed as a set of general guidelines rather than as a set of restrictions and obligations whose observance is required of all Jews. Historically, special courts enforce Jewish law, today, these courts still exist but the practice of Judaism is mostly voluntary. Authority on theological and legal matters is not vested in any one person or organization, but in the sacred texts and the rabbis and scholars who interpret them.