Craig Keener identifies some of the ideas that has led many to think that membership in a certain group is salvific. A better reading of the Torah sees both authentic believers in Israel’s history alongside “wicked fools” (see 2 Samuel 13.13). For certain, the New Covenant replaces the Old Covenant but nowhere does the bible speak of a replacement of peoples. For sure God worked with National Israel but most (10 tribes) were divorced by the Lord for unfaithfulness. Salvation is from the Lord and not based on affiliation of group membership. Since Jesus inaugurated The New Covenant, all peoples weather Jew or Gentile have equal status and are accepted having their hearts cleansed by faith:

Paul certainly cared about Gentiles; his letters are replete with signs of his intimate concern for the members of the many congregations he started, many of whose members were Gentiles. The Bible also suggests that the Lord will return after the good news has been proclaimed among all peoples (Matt 24:14), probably related to Paul’s…

via Provoking Israel’s jealousy—Romans 11 — Bible BackgroundBible Background