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.
Jewish political movements
There are also a number of Jewish secular organizations at the local, national, and international levels. These organizations often play an important part in the Jewish community. Most of the largest groups, such as Hadassah and the United Jewish Communities, have an elected leadership. No one secular group represents the entire Jewish community, and there is often significant internal debate among Jews about the stances these organizations take on affairs dealing with the Jewish community as a whole, such as antisemitism and Israeli policies. In the United States and Canada today, the mainly secular United Jewish Communities (UJC), formerly known as the United Jewish Appeal (UJA), represents over 150 Jewish Federations and 400 independent communities across North America. Every major American city has its local "Jewish Federation", and many have sophisticated community centers and provide services, mainly health care-related. They raise record sums of money for philanthropic and humanitarian causes in North America and Israel. Other organizations such as the Anti-Defamation League, American Jewish Congress, American Jewish Committee, American Israel Public Affairs Committee, Zionist Organization of America, Americans for a safe Israel, B'nai B'rith and Agudath Israel represent different segments of the American Jewish community on a variety of issues.