True. There is only one covenant between God and man on earth, by the blood of Jesus Christ through faith.
The NT body of Christ on earth, is the only holy nation and Israel of God, in which all natural nations may be grafted into, including natural Israeli Jews, Hellene Greeks, barbarian Scythians, Ethiopians, British, Madagascardians...
Jhn 10:16
And other sheep I have, which are not of this fold: them also I must bring, and they shall hear my voice; and there shall be one fold, and one shepherd.
11:51
And this spake he not of himself: but being high priest that year, he prophesied that Jesus should die for that nation; And not for that nation only, but that also he should gather together in one the children of God that were scattered abroad.
Anti-Goyim natural Jews reject Jesus' gospel of repentance preached to all nations:
Luke 24:47
And that repentance and remission of sins should be preached in his name among all nations, beginning at Jerusalem.
And Christian Gentiles appeal to anti-goyim Jews, by separating themselves from natural Jews in the body of Christ. They both reject being gathered together in one nation of God, by
segregating themselves from one another after the flesh.
Anti-goyim natural Jews, I understand. Prejudiced natural pride is among all nations on earth.
But, anti-Jewish Christian Gentiles is a greater sin, since the days of the apostles. Romans 11 is all about Christians not being high-minded in their holy olive tree grafting by Jesus Christ, as though the natural Jews have no part in the holy nation of Israel, because they had Jesus Christ crucified on a cross...
Rom 11:18
Boast not against the branches. But if thou boast, thou bearest not the root, but the root thee. Thou wilt say then, The branches were broken off, that I might be graffed in. Well; because of unbelief they were broken off, and thou standest by faith. Be not highminded, but fear: For if God spared not the natural branches, take heed lest he also spare not thee. And they also, if they abide not still in unbelief, shall be graffed in: for God is able to graff them in again.
There are no Christian Gentiles. There are no Christian Jews. There are only Christians born into the one holy body and nation of the risen God of Israel, Jesus Christ.
1Co 12:13
For by one Spirit are we all baptized into one body, whether we be Jews or Hellenes, whether we be bond or free; and have been all made to drink into one Spirit.
There are only Christians that are natural Jews, Hellenes, Scythians, Russians... And there are no Gentiles at all in the Scriptures of God.
The 'Gentile' ideology only exists in two false religions on earth: The anti-Goyim Jews' religion, and the anti-Jews Christian religion, neither of which are the pure religion of Jesus Christ.