The Jewish denominations, in one map

What it is

A Jewish denomination is not a church. Nobody assigns you one at birth and nobody checks. What the labels track is a disagreement over a single question: is halacha, Jewish law, binding, and if it moves, who is allowed to move it. Almost everything else follows from the answer.

Orthodox Judaism holds that both the Written and the Oral Torah are of divine origin and represent the word of God, traced to Sinai, interpreted across generations, and codified in Joseph Karo's Shulhan Arukh in the 16th century alongside Moshe Isserles's Mapah. ⁵ Law binds, and the room to move is inside the system rather than around it.

Inside Orthodoxy there are camps. Pew's 2013 survey of American Orthodox Jews found 62% identified as Haredi, understanding strict Torah adherence as incompatible with full participation in secular society, and 31% as Modern Orthodox, keeping traditional law while integrating into modern life. ² Among Modern Orthodox adults, 29% held postgraduate degrees, against 10% of Haredim. ² Orthodox Jews aged 40 to 59 averaged 4.1 children, against 1.7 for other American Jews. ² The political gap with the rest of American Jewry is the widest of any: 57% of Orthodox Jews identified as Republican, against 18% of other Jews. ² Hasidic Jews are a Haredi subgroup, and Orthodoxy is the only major movement that preserved the mystical foundations of Jewish theology, most obviously in the Hasidic movements and no less in the yeshiva world. ⁵

Conservative Judaism holds that halacha binds and that the halachic process reflects the divine will, while insisting Judaism has always adapted to changed circumstances. ⁶ Its Committee on Jewish Law and Standards is the movement's halachic authority, and a ruling becomes a binding "standard" only with 80% approval from the CJLS plus a majority vote from the Rabbinical Assembly plenum. There are four, covering intermarriage, remarriage, matrilineal descent, and conversion requirements. ⁶ Underneath the decisions sits Solomon Schechter's idea of Klal Yisrael, the practice of the observant community. ⁶

Reform came out of the German Jewish encounter with citizenship. Between 1810 and 1820, congregations in Seesen, Hamburg, and Berlin introduced mixed seating, single-day festivals, and cantorial music. ⁷ Abraham Geiger studied Jewish history and concluded that "Jewish life had continually changed" and would have to keep changing. ⁷ Isaac Mayer Wise, who arrived from Bohemia in 1846, built the American institutions: Hebrew Union College in Cincinnati in 1875, the Central Conference of American Rabbis in 1889. ⁷ The sharpest statement of the early American position is the Pittsburgh Platform of November 1885, which accepted from the Mosaic legislation "only its moral laws" as binding and held that the laws regulating diet, priestly purity, and dress came from ages shaped by ideas foreign to modern life. ⁸

Reconstructionism is the youngest and the most explicit. Mordecai Kaplan, 1881 to 1983, taught at the Jewish Theological Seminary from 1909 to 1963 and described Judaism as the evolving religious civilization of the Jewish people, publishing Judaism as a Civilization in 1934. ⁹ He rejected the idea that Jewish law carries absolute authority and recast traditional practice as folkways. ⁹ The movement's formulation is that tradition gets a vote but not a veto. ⁹ The Reconstructionist Rabbinical College opened in Philadelphia in 1968 with Ira Eisenstein as its first president. ⁹

Why it still matters

The American map is not the one most people picture. Pew's survey of roughly 5.8 million Jewish adults, fielded November 19, 2019 through June 3, 2020, found 37% Reform, 17% Conservative, 9% Orthodox, 4% other branches including Reconstructionist and Humanistic, and 32% claiming no particular branch. ¹ The second-largest bloc in American Jewish life is people who decline to pick. The denominational map now describes a shrinking share of how American Jews actually sort themselves.

Among Jews 65 and older, 3% identified as Orthodox. Among Jews 18 to 29, 17% identified as Orthodox, plus another 11% who identified as Haredi. ¹ Meanwhile the overall Orthodox share barely moved between 2013 and 2020, from 10% to 9%. ¹ Orthodox and unaffiliated are both growing in the same cohort, and the middle is thinning out.

Israel's map looks nothing like the American one. Its working categories are not Reform and Conservative. Pew's face-to-face survey of 5,601 Israeli adults, including 3,789 Jews, conducted October 2014 through May 2015, found Israeli Jews split 49% Hiloni (secular), 29% Masorti (traditional), 13% Dati (religious), and 9% Haredi. ³ Asked instead to place themselves in the international streams, 50% of Israeli Jews said Orthodox, 3% Reform, 2% Conservative, and 41% no particular stream. ⁴ Pew's own caution belongs here: Masortim and Hilonim have no direct American equivalents, even though Masorti is the Conservative movement's official name in Israel. ⁴

So an Israeli Masorti and an American Masorti are usually describing different lives with the same word.

Orthodox rabbis control Jewish marriage in Israel, and the question of whether non-Orthodox rabbis may perform marriages divides Israelis along exactly the lines above, with Haredim opposed and most secular Jews in favor. ³ The two movements that account for 54% of American Jewish identification account for about 5% of Israeli Jewish identification and hold no authority over personal status. ¹⁴ That asymmetry is the engine under most of the recurring fights over conversion, the Kotel, and whose Jewishness gets recognized by whom.

None of this is a ranking. Each movement is answering a real question that the others also have to answer, and each answer costs something. Orthodoxy pays in accessibility and gets continuity. Reform pays in continuity and gets people who would otherwise be gone. Conservative Judaism tries to hold both, which is the hardest position to hold and the one most exposed to argument from either side. Its share of American Jews was 18% in Pew's 2013 figures and 17% in 2020. ^{4 1}

The words you'll hear

Halacha. Jewish law. Orthodoxy holds it to be of divine origin and binding, codified in Joseph Karo's Shulhan Arukh. ⁵ The movements differ mainly over how binding it is and who may change it. ^{6 9}

Haredi. The stricter wing of Orthodoxy, 62% of American Orthodox Jews in Pew's 2013 survey and 9% of Israeli Jews in its 2014 to 2015 survey, holding that strict Torah adherence does not fit with full participation in secular society. ^{2 3}

Modern Orthodox. 31% of American Orthodox Jews, keeping traditional Jewish law while integrating into modern society; 29% hold postgraduate degrees, against 10% of Haredim. ²

Masorti. In Israel, a self-description meaning traditional, chosen by 29% of Israeli Jews; also the official name of the Conservative movement in Israel. Pew notes the two are not equivalent. ^{3 4}

Hiloni. Secular, and the largest single category in Israeli Jewish life at 49%. ³

CJLS. The Conservative movement's Committee on Jewish Law and Standards, which sets binding standards by an 80% committee vote plus a Rabbinical Assembly plenum majority, and has issued four of them. ⁶

A vote but not a veto. The Reconstructionist formulation of tradition's authority, following Mordecai Kaplan's rejection of halacha as absolute. ⁹