Romans 11
"For God has shut up all in disobedience that He might show mercy to all" (v32). God does not favor one group over another. The Gentiles (the wild olive branch) were grafted into God's family (the olive tree) by faith (v20). However, the Jews - the natural branches broken off due to unbelief - might also by faith be grafted in again (v23). "Do not be conceited," Paul warned (v20); our salvation is undeserved.
We all approach God through the loving sacrifice of Jesus. It is only by mercy that we (Jew or Gentile) belong to Him.