Some people think otherwise., because the book of Romans says that all Israel will be saved. If people are going to Heaven just for having Jewish blood, then the Pharisees were right and Jesus was wrong.
I believe the Biblie. If it says that all Jews in the end times will be saved because they're Jews, then I believe it. In the meantime, though, every Christian has a responsibility to present the Gospel to every non-Christian, and that includes the Jews.