Why would Paul's assertion that salvation was available to gentiles seem counterintuitive to Jews of his day? How did he justify the inclusion of gentiles in his mission?

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The Answer is According to Paul, the salvation that came through Jesus was available to all people, not just to Jews. Paul, moreover, taught that Gentiles should not convert to Judaism-Jesus brought God's promises to all people. This message would sound strange to Jews in antiquity: If Jesus was Israel's messiah and his coming was in accordance with God's plan, then this salvation should have been brought to God's chosen people, the people with whom God had made a covenant. Paul, though, spent his missionary life arguing vehemently against the idea that justification was restricted to Jews. In particular, he argued that the Law did not make anyone righteous, so keeping the Jewish Law will not put one in a right standing with God. Instead, only the grace of God through Christ can make a person righteous enough to please God. As a result, it is not necessary for Gentiles to keep the Jewish Law; instead, they must receive the Holy Spirit, which will make them righteous and therefore lead to salvation. Paul also asserted that the inclusion of the Gentiles does not invalidate God's promise to Israel but instead fulfills it (he references the covenant with Abraham to illustrate this)-gentiles can be incorporated but Jews need not be excluded.

Why Would Paul's Assertion That Salvation Was Available to Gentiles