Judaism
There are some movements that combine elements of Judaism with those of other religions. The most well-known of these is Messianic Judaism, a religious movement, which arose in the 1960s, that incorporates elements of Judaism with the tenets of Christianity. The movement generally states that Jesus is the Jewish Messiah, that he is one of the Three Divine Persons, and that salvation is only achieved through acceptance of Jesus as one's savior. Some members of the movement argue that Messianic Judaism is a sect of Judaism. Jewish organizations of every denomination reject this, stating that Messianic Judaism is a Christian sect, because it teaches creeds which are identical to those of Pauline Christianity.
Origins of Judaism
Judaism has its origins in the Iron Age Kingdom of Judah and in Second Temple Judaism. It has three essential and related elements: study of the written Torah (the books of Genesis, Exodus, Leviticus, Numbers, and Deuteronomy); the recognition of Israel (defined as the descendants of Abraham through his grandson Jacob) as a people elected by God as recipients of the law at Mount Sinai, his chosen people; and the requirement that Israel live in accordance with God's laws as given in the Torah.