Rabbinic Judaism at one time was related to Samaritanism; however Samaritans no longer refer to themselves as Jews, and both groups view themselves as separate religions.
Around the first century A.D. there were several large sects of Jewish leadership, generally each differently seeking a messianic salvation as national autonomy from the Roman Empire: the Pharisees, Sadducees, Zealots, Essenes, and Christians. After the destruction of the Second Temple in 70 C.E., these sects vanished. Christianity survived, but by breaking with Judaism and becoming a separate religion; the Pharisees survived but in the form of Rabbinic Judaism (today, known simply as "Judaism").
Some Jews in the 8th century adopted the Sadducees' rejection of the oral law of the Pharisees / Rabbis recorded in the Mishnah (and developed by later Rabbis in the two Talmuds), intending to rely only upon the Tanakh. Interestingly, they soon developed oral traditions of their own which differ from the Rabbinic traditions. These Jews formed the Karaite sect, which still exist to this day, though they are much smaller than the rest of Judaism. Rabbinic Jews hold that Karaites are Jews, but that their religion is an incomplete and erroneous form of Judaism.
Over time Jews developed into distinct ethnic groups: the Ashkenazi Jews (of Eastern Europe and Russia); the Sephardi Jews (of Spain, Portugal and North Africa) and the Yemenite Jews, from the southern tip of the Arabian peninsula. This split is cultural, and is not based on any doctrinal dispute.
Development of Hasidic Judaism
Hasidic Judaism was founded by Israel ben Eliezer (1700-1760), also known as the Ba'al Shem Tov, or the Besht. His disciples attracted many followers; they themselves established numerous Hasidic sects across Europe. Hasidic Judaism eventually became the way of life for many Jews in Europe; it came to the United States during the large waves of Jewish emigration in the 1880s.
Early on, there was a serious schism between the Hasidic and non-Hasidic Jews. European Jews who rejected the Hasidic movement were dubbed by the Hasidim as mitnagdim, (lit. "opponents"). Some of the reasons for the rejection of Hasidic Judaism were the overwhelming exuberance of Hasidic worship; their untraditional ascriptions of infallibility and alleged miracle-working to their leaders, and the concern that it might become a messianic sect. Since then all the sects of Hasidic Judaism have been subsumed into mainstream Orthodox Judaism, particulary Ultra-Orthodox Judaism.
Development of modern denominations in response to the Enlightenment
In the late 18th century Europe was swept by a group of intellectual, social and political movements known as the Enlightenment. Judaism developed into several distinct denominations in response to this unprecedented phenomenon: Reform Judaism and Liberal Judaism, many forms of Orthodox Judaism, Conservative Judaism, and a number of smaller groups as well.
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