Judaism is the religious, cultural, and legal tradition of the Jewish people, encompassing belief in one God (monotheism), a body of law and ethics (halakha) derived primarily from the Hebrew Bible (Tanakh) and its rabbinic interpretive tradition (the Talmud), and a shared peoplehood with historical roots in the ancient Israelites. Whether Judaism is best understood primarily as a religion, an ethnicity, a nationality, a culture, or some combination of these is itself a matter of ongoing discussion; see judaism-nature-of-identity-viewpoint-debate. Judaism is generally considered the oldest of the Abrahamic religions and the historical predecessor to Christianity, and, along with Christianity, a major influence on the later development of Islam.
Contemporary Judaism is organized into several major denominations that differ in their approach to religious law, scriptural interpretation, and modernity, including Orthodox, Conservative, Reform, and Reconstructionist movements, along with smaller groups such as Karaite and Humanistic Judaism. These denominations disagree on questions including the divine versus human origin of religious law, the authority of rabbinic tradition, and the permissibility of adapting practice to modern circumstances; see judaism-religious-authority-debate. Worldwide, the Jewish population is estimated at approximately 15-16 million people, with the largest communities in Israel and the United States. Practice ranges from strict observance of dietary laws (kashrut), Sabbath restrictions, and the 613 commandments (mitzvot) as enumerated in classical sources, to secular or cultural identification with Jewish heritage without religious observance.
A significant point of internal and external discussion concerns the age and origin of the world and humanity as described in Genesis, with positions ranging from literal six-day creation to various forms of theological accommodation with evolutionary biology and geological timescales; see Young Earth Creationism and judaism-creation-and-cosmology-viewpoint-debate.
1. Michael Satlow, *How the Bible Became Holy* (New Haven: Yale University Press, 2014). 2. Jacob Neusner, *The Way of Torah: An Introduction to Judaism*, 7th ed. (Belmont, CA: Wadsworth, 2003). 3. Pew Research Center, *Jewish Americans in 2020* (Washington, DC: Pew Research Center, 2021). 4. Daniel Gordis, *Judaism: A Conceptual Guide* (New York: Wicked Son, 2024).