Apostles
Later in the Gospel narratives the twelve apostles are described as having been commissioned to preach the Gospel to "all the nations", regardless of whether Jew or Gentile. Paul emphasized the important role of the apostles in the church of God when he said that the household of God is "built upon the foundation of apostles and prophets, Christ Jesus himself being the cornerstone".
Although not one of the apostles commissioned during the life of Jesus, Paul, a Jew named Saul of Tarsus, claimed a special commission from the risen Jesus and is considered "the apostle of the Gentiles", for his missions to spread the gospel message after his conversion. In his writings, the epistles to Christian churches throughout the Levant, Paul did not restrict the term "apostle" to the Twelve, and often refers to his mentor Barnabas as an apostle. The restricted usage appears in the Revelation to John.
Messianic Judaism
Jewish opponents of Messianic Judaism often focus their criticism on the movement's radical ideological separation from traditional Jewish beliefs, stating that the acceptance of Jesus as Messiah creates an insuperable divide between the traditional messianic expectations of Judaism, and Christianity's theological claims. They state that while Judaism is a messianic religion, its messiah is not Jesus, and thus the term is misleading. All denominations of Judaism, as well as national Jewish organizations, reject Messianic Judaism as a form of Judaism. Regarding this divide, Reconstructionist Rabbi Carol Harris-Shapiro observed:To embrace the radioactive core of goyishness—Jesus—violates the final taboo of Jewishness[.] ... Belief in Jesus as Messiah is not simply a heretical belief, as it may have been in the first century; it has become the equivalent to an act of ethno-cultural suicide.