It was prophesied a number of times in the Old testament, that Gid would extend his grace and salvation to the Gentiles by way of his new covenant. Israel would be provoked to jealousy by these foolish people. You can see this opposition everywhere Paul and others went preaching the Word to the heathen, and its the same today. However, the grace of God prevails. In the church of God, Jews and Gentiles are one body.