The True Israel, the Church are those people who have Abraham’s spiritual faith regardless of their ethnicity Gal 3:7,26-29
7 Know ye therefore that they which are of faith, the same are the children of Abraham.
26 For ye are all the children of God by faith in Christ Jesus.
27 For as many of you as have been baptized into Christ have put on Christ.
28 There is neither Jew nor Greek, there is neither bond nor free, there is neither male nor female: for ye are all one in Christ Jesus.
29 And if ye be Christ's, then are ye Abraham's seed, and heirs according to the promise.
Rom 4:16
16 Therefore it is of faith, that it might be by grace; to the end the promise might be sure to all the seed; not to that only which is of the law, but to that also which is of the faith of Abraham; who is the father of us all,
Gal 6:16
16 And as many as walk according to this rule[rule of faith], peace be on them, and mercy, and upon the Israel of God. 7