Origins of Judaism
For centuries, the traditional understanding has been that Judaism came before Christianity and that Christianity separated from Judaism some time after the destruction of the Second Temple in 70 CE. Starting in the latter half of the 20th century, some scholars have begun to argue that the historical picture is quite a bit more complicated than that. In the 1st century, many Jewish sects existed in competition with each other, see Second Temple Judaism. The sects which eventually became Rabbinic Judaism and Early Christianity were but two of these. Some scholars have begun to propose a model which envisions a twin birth of Christianity and Judaism rather than a separation of the former from the latter. For example, Robert Goldenberg (2002) asserts that it is increasingly accepted among scholars that "at the end of the 1st century CE there were not yet two separate religions called "Judaism" and "Christianity"".
Daniel Boyarin (2002) proposes a revised understanding of the interactions between nascent Christianity and nascent Rabbinical Judaism in Late Antiquity which views the two religions as intensely and complexly intertwined throughout this period.
Hasidic Judaism
The Bobover dynasty, founded 1881 in Bobowa, West Galicia, constitutes some 4,500 households in total and has undergone a bitter succession strife since 2005, eventually forming the "Bobov" (3,000 households) and "Bobov-45" (1,500 households) sects. Sanz-Klausenburg, divided into a New York and Israeli branches, presides over 3,800 households. The Skver sect, established in 1848 in Skvyra near Kiev, constitutes 3,300. The Shomer Emunim dynasties, originating in Jerusalem during the 1920s and known for their unique style of dressing imitating that of the Old Yishuv, have over 3,000 families, almost all in the larger "courts" of Toldos Aharon and Toldos Avraham Yitzchak. Karlin Stolin, which rose already in the 1760s in a quarter of Pinsk, encompasses 2,200 families.