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.
Judaism
The Jewish Enlightenment of the late 18th century resulted in the division of Ashkenazi (Western) Jewry into religious movements or denominations, especially in North America and Anglophone countries. The main denominations today outside Israel (where the situation is rather different) are Orthodox, Conservative, and Reform.While traditions and customs (see also "Sephardic law and customs") vary between discrete communities, it can be said that Sephardi and Mizrahi Jewish communities do not generally adhere to the "movement" framework popular in and among Ashkenazi Jewry. Historically, Sephardi and Mizrahi communities have eschewed denominations in favour of a "big tent" approach. This is particularly the case in contemporary Israel, which is home to the largest communities of Sephardi and Mizrahi Jews in the world. (However, individual Sephardi and Mizrahi Jews may be members of or attend synagogues that do adhere to one Ashkenazi-inflected movement or another.)