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.
American Jews
The survey found that of the 4.3 million strongly connected Jews, 46% belong to a synagogue. Among those households who belong to a synagogue, 38% are members of Reform synagogues, 33% Conservative, 22% Orthodox, 2% Reconstructionist, and 5% other types. Traditionally, Sephardic and Mizrahis do not have different branches (Orthodox, Conservative, Reform, etc.) but usually remain observant and religious. The survey discovered that Jews in the Northeast and Midwest are generally more observant than Jews in the South or West. Reflecting a trend also observed among other religious groups, Jews in the Northwestern United States are typically the least observant.