The all Israel that shall be saved is the Church the Body of Christ where race isnt a factor Gal 3:28-29
Jews populate the Church of the Lord Jesus Christ, and why not? He has covenant with the Hebrew people to save the Hebrew people going all the way back to Abraham.
The Law, the Psalms, and the Prophets are writings of 39 "books" ALL authored by Hebrew authors from all walks of Hebrew life and these writings are God's Word to the Hebrew people. They are His Church (Greek: "ekklesia" = "called out [ones]") for they (the Hebrew people) were called out of Egypt just as He promised Abraham in Genesis 15. God also "called out" baby Jesus out of Egypt after baby Jesus' enemies were all dead and Joseph and Mary settled in Nazareth.
Besides various personal individual promises God made to certain people like David, and Moses, and Joseph, etc., God made a national covenant with the children of Israel through Abraham that extended to his Hebrew seed (Isaac, Jacob, Jacob's twelve sons, etc.), and the three divisions of the Hebrew Scripture record God's dealings with this people, with the giving of God's Law that instructs and commands the Hebrew people in all aspects of Hebrew life, religion, culture, politics, and society. There is no other covenants between God and man except the three major national covenants that in each include the Hebrew people. The Abraham Covenant is between God, Abram the Hebrew (Gen. 14:13 - as he is ethnically described by God), and with Abram's Hebrew seed, a people whose population would grow in 400 years of slavery in Egypt to become 2-3 million Hebrew people, God also made covenant with the children of Israel beginning in Egypt with Passover and including the giving Of God's Law to this people in the desert at the time of the Tabernacle, and the New Covenant which Jeremiah the prophets prophesied was to include the God of Abraham and the House of Israel (ten northern kingdom tribes), and the House of Judah (two southern kingdom tribes.)
There is no Scripture that the God of Abraham ever made covenant promises to non-Hebrew Gentiles and non-Hebrew Gentiles are NOT included in any of these three Hebrew covenants.
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]Israel], and heirs according to the promise.
You quote Galatians 3:28-29 and this letter written by Saul was written to Jews and Jewish Christians, especially where you quote Galatians, which Saul is addressing the Jewish Christians in the region who have become followers of Christ and very concerned with their standing in the Abraham Covenant. He is the quote from Saul himself:
You do know how to read a letter, yes?
19 Wherefore then serveth
the law? It was added because of transgressions, till the seed should come
to whom the promise was made; and it was ordained by angels in the hand of a mediator.
20 Now a mediator is not a mediator of one, but God is one.
21 Is
the law then against the promises of God? God forbid: for if there had been a law given which could have given life, verily righteousness should have been by the law.
22 But the scripture hath concluded
all [JEWS] under sin, that the promise by faith of Jesus Christ might be given
to them that believe [meaning the JEWS].
23 But before faith came,
we [JEWS] were kept under
the law, shut up unto the faith which should afterwards be revealed.
24 Wherefore
the law was
our [JEWS] schoolmaster to bring
us [JEWS] unto Christ, that
we [JEWS] might be justified by faith.
25 But after that faith is come,
we [JEWS} are no longer under a schoolmaster.
26 For
ye [JEWS] are all the children of God by faith in Christ Jesus.
27 For as many of
you [JEWS] as have been baptized into Christ have put on Christ.
Saul goes on to comfort and encourage those Jewish Christians who became followers of Christ that it is precisely because they are followers of Christ who was prophesied by the Jewish prophets that they are all one in Christ, and if they are all one in Christ that they are STILL Abraham's seed and HEIRS according to those promises. Notice Saul includes Hellenized Hebrews by mentioning those who were raised in GREEK culture and that Saul does NOT say "Gentile."
28 There is neither Jew nor Greek, there is neither bond nor free, there is neither male nor female: for
ye [JEWS] are all one in Christ Jesus.
29 And if
ye [JEWS] be Christ’s, then are
ye [JEWS STILL and] Abraham’s seed, and heirs according to the promise.
Galatians 3:19–29.
ONLY the Hebrew seed of Abraham are in the Abraham and Mosaic Covenants. Gentiles have NEVER been "under a schoolmaster/The Law" and were NEVER the rightful heir of those covenant promises God gave to father Abraham.
Saul is NOT addressing non-Hebrew Gentiles because Gentiles were never under the Law he identified as a "schoolmaster" that leads a Jew to Christ and through Christ to their God.
To say that these verses - let alone the whole letter - is addressed to uncircumcised, non-Hebrew, non-covenant Gentiles who were NEVER in any of the Hebrew covenants clearly shows you have no reading comprehension and for you to claim against all the evidence-points I identified is to unrighteously hold to false teaching against God who you claim to serve.
God made NO COVENANT with Gentiles. NONE!