You are mistaking Old Israel, which rejected Christ the Messiah, for the New Israel of God, all those who are redeemed in Christ. The latter are destined for eternal life; all others will ultimately meet only destruction, be they Jews or Gentiles.
There is no "new Israel." That is called "replacement theology" and is a theological heresy. Israel is Israel. The Church is the Church. The Bible never calls the Church, "Israel."
Sorry, but you are simply wrong; theological name-calling does not change that! the new Testament writers are very clear that the Church is the new Israel, the new Jerusalem. There is no salvation outside of faith in Christ Jesus, for Jews or Gentiles; to say otherwise is the most obvious heresy.