This question was sent to the Angelus Press (magazine) October 1991, questions and answers and it was Fr. James Doran who gave the answers at the time.(J.S.Hawthorne, CA)
The non-Jews are thus the “wild olive” grafted onto the root: The Hebrew Nation. St. Paul cautions any arrogance among those now in the Church with the following words: “For if God had not spared the natural branches, fear least perhaps, He also spared not thee.” (11:21).
This being the overall pictures of the mystery of salvation it still remains to be said that even if the nation of the Jews will, as a moral whole, convert before the end of the world, they still remain at this time in infidelity. They are the children of wrath.
Abraham was justified for his faith, and therefore, all those who have the faith of Christ, the chosen offspring of Abraham, are the children of Abraham and thus the true Israel. “Know thee therefore, that they who are of faith, the same are the children of Abraham. And the scripture, for seeing, that God justifeth the Gentiles by faith, so unto Abraham before: ‘In thee shall all nations be blessed.’ Therefore, they that are of faith shall be blessed with the faithful Abraham.” (Gal. 3:7-9).
And:”For you are all the children of God by faith, in Christ Jesus…And if you be Christ’s, then you are the seed of Abraham, heir’s according to the promise.” (Gal. 3:29).
Therefore, any who possesses the true faith of Christ, being the seed of Abraham, regardless of nationality, are the true Israel as opposed to the Israel of the flesh. The Catholic (Universal) Church is the Israel of God flowering forth in the Precious Blood of His Divine Son and truly then the, “Chosen People.”