Judaism
Christianity was originally a sect of Second Temple Judaism, but the two religions diverged in the first century. The differences between Christianity and Judaism originally centered on whether Jesus was the Jewish Messiah but eventually became irreconcilable. Major differences between the two faiths include the nature of the Messiah, of atonement and sin, the status of God's commandments to Israel, and perhaps most significantly of the nature of God himself. Due to these differences, Judaism traditionally regards Christianity as Shituf or worship of the God of Israel which is not monotheistic. Christianity has traditionally regarded Judaism as obsolete with the invention of Christianity and Jews as a people replaced by the Church, though a Christian belief in dual-covenant theology emerged as a phenomenon following Christian reflection on how their theology influenced the Nazi Holocaust.
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.