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 religious movements
Most streams of modern Judaism developed from the Pharisaic movement, which became known as Rabbinic Judaism (in Hebrew "Yahadut Rabanit" - יהדות רבנית) with the compilation of the Oral Torah into the Mishna. After the destruction of the Second Temple and the Bar Kokhba revolt the other movements disappeared from the historical record, yet the Sadducees probably kept on existing in a non-organized form for at least several more decades. A scholar named Rodkinson claimed about a century ago that the Sadducees ultimately changed their name and are those who are referred to as the "Qara'im" and "Ba`alei Miqra" in the Talmud.