Those verses have always, then and now, referred to "the Israel of God": i.e., Believing Jews and also those gentiles who are incorporated into this Believing-Jewish community.
It's not my wife's Conversos/Sephardic Jewish (i.e., Spanish-Jewish, on her mother's side, by way of Mexico) ethnic heritage which makes her part of the Israel of God, but rather her belief in Jesus Christ.
She knows this; I wonder why many gentiles don't.