Romans 9:6-11
6 Not as though the word of God hath taken none effect.
For they are not all Israel, which are of Israel:
7 Neither, because they are the seed of Abraham, are they all children: but, In Isaac shall thy seed be called.
8 That is,
They which are the children of the flesh, these are not the children of God: but the children of the promise are counted for the seed.
9 For this is the word of promise, At this time will I come, and Sarah shall have a son.
10 And not only this; but when Rebecca also had conceived by one, even by our father Isaac;
11 (For the children being not yet born, neither having done any good or evil, that
the purpose of God according to election might stand, not of works, but of him that calleth
Galatians 3:6-7
6 Even as Abraham believed God, and it was accounted to him for righteousness.
7 Know ye therefore that they which are of faith,
the same are the children of Abraham.
Galatians 3:28-29
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.
Who is Israel? The children of Abraham.
Who are the children of Abraham? The children of God.
Who are the children of God? Neither jew nor greek, bond nor free, male or female. All who are Christs are the children of God.
Israel has always been the children of God and the children of God have always been Israel. But only those who are of Faith like Abraham are the true children. Not of the flesh like 99.99% of people mistakenly think.