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.
Anti-Zionism
Most Orthodox religious groups have accepted and actively support the State of Israel, even if they have not adopted "Zionist" ideology. The World Agudath Israel party (founded in Poland) has at times participated in Israeli government coalitions. Most religious Zionists hold pro-Israel views from a right-wing viewpoint. The main exceptions are Hasidic groups such as Satmar Hasidim, which have about 100,000 adherents worldwide, as well as numerous different, smaller Hasidic groups, unified in America in the Central Rabbinical Congress of the United States and Canada and in Israel in the Edah HaChareidis.