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 Karaites and Sabbateans during the early and later medieval period; and among segments of the modern non-Orthodox denominations. Modern branches of Judaism such as Humanistic Judaism may be nontheistic. Today, the largest Jewish religious movements are Orthodox Judaism (Haredi Judaism and Modern Orthodox Judaism), Conservative Judaism and Reform Judaism. Major 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 "traditional" 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 enforced 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 rabbis and scholars who interpret them.
The history of Judaism spans more than 3,000 years. Judaism has its roots as a structured religion in the Middle East during the Bronze Age. Judaism is considered one of the oldest monotheistic religions. The Hebrews and Israelites were already referred to as "Jews" in later books of the Tanakh such as the Book of Esther, with the term Jews replacing the title "Children of Israel". Judaism's texts, traditions and values strongly influenced later Abrahamic religions, including Christianity, Islam and the Baha'i Faith. Many aspects of Judaism have also directly or indirectly influenced secular Western ethics and civil law. Hebraism is just as important a factor in the development of Western civilization as Hellenism, and Judaism, as the mother religion of Christianity, has considerably shaped Western ideals and morality since the Christian Era.
Jews are an ethnoreligious group and include those born Jewish and converts to Judaism. In 2015, the world Jewish population was estimated at about 14.3 million, or roughly 0.2% of the total world population. About 43% of all Jews reside in Israel and another 43% reside in the United States and Canada, with most of the remainder living in Europe, and other minority groups spread throughout South America, Asia, Africa, and Australia.
Unlike other ancient Near Eastern gods, the Hebrew God is portrayed as unitary and solitary; consequently, the Hebrew God's principal relationships are not with other gods, but with the world, and more specifically, with the people he created. Judaism thus begins with ethical monotheism: the belief that God is one and is concerned with the actions of mankind. According to the Tanakh (Hebrew Bible), God promised Abraham to make of his offspring a great nation. Many generations later, he commanded the nation of Israel to love and worship only one God; that is, the Jewish nation is to reciprocate God's concern for the world. He also commanded the Jewish people to love one another; that is, Jews are to imitate God's love for people. These commandments are but two of a large corpus of commandments and laws that constitute this covenant, which is the substance of Judaism.
Thus, although there is an esoteric tradition in Judaism (Kabbalah), Rabbinic scholar Max Kadushin has characterized normative Judaism as "normal mysticism", because it involves everyday personal experiences of God through ways or modes that are common to all Jews. This is played out through the observance of the Halakha (Jewish law) and given verbal expression in the Birkat Ha-Mizvot, the short blessings that are spoken every time a positive commandment is to be fulfilled.