Beware of conflating Abraham with the nation of Israel.
'There is neither Jew nor Greek, there is neither slave nor free, there is neither male nor female; for you are all one in Christ Jesus.
And if you are Christ's then you are Abraham's seed and heirs according to the promise.'
You guys wear this verse out and reject the Abrahamic covenant and all it's promises to the physical seed of Abraham. All your mental brilliance is lost because of your stubborn pride in your refusal to believe the word of God and to make sense of it. Abraham is never said to be Israel or even a nation. Abraham is the originator of Israel by virtue of being his "father" and without him there would not be a family or a nation of Israel. Jacob/Israel is not the only son of Abraham who became a family and nation but he is the only one with whom God made an everlasting covenant to benefit the other nations and families on the earth by charging this nation to produce the savior of all mankind and so, their spiritual blessings depend on this family Israel. Not only this family broadly but God focused on one son, family, nation, namely Judah to accomplish his redemptive purposes.
I do not mean to falsely accuse you and if you are a believer in the Abrahamic covenant and understand it as being the guarantee of world wide atonement then you can forgive me for including you.
Paul defends salvation by grace through faith without the deeds of the law in this chapter by comparing the Abrahamic Covenant with the Mosaic covenant and citing their distinct purposes. The Law, he said, was a temporary covenant, an addendum, to the eternal Abraham covenant in which the Covenant of salvation was made and would end when the promise was realized. Not only Abraham and Israel his son would benefit but all the families of the earth But Israel certainly would and those who received the promise (the Spirit of life) would be born of God and become the Israel of God. Physically they would still be the sons of Abraham through Jacob but would be the sons of God by the new birth.
Ga 3:2 This only would I learn of you, Received ye the Spirit by the works of the law, or by the hearing of faith?
He therefore that ministereth to you the Spirit, and worketh miracles among you, doeth he it by the works of the law, or by the hearing of faith?
Abraham the beginning:
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.
8 And the scripture, foreseeing that God would justify the heathen through faith, preached before the gospel unto Abraham, saying, In thee shall all nations be blessed.
9 So then they which be of faith are blessed with faithful Abraham.
13 Christ hath redeemed us from the curse of the law, being made a curse for us: for it is written, Cursed is every one that hangeth on a tree:
The cross first for salvation = the promise of the Spirit
14 That the blessing of Abraham might come on the Gentiles through Jesus Christ; that we might receive the promise of the Spirit through faith.
The Spirit came on the gentiles in Acts 10, AD 40.
16 Now to Abraham and his seed were the promises made. He saith not, And to seeds, as of many; but as of one, And to thy seed, which is Christ. See Ge 12.
This was before any nations came from Abraham.
17 And this I say, that the covenant, that was confirmed before of God in Christ,
the law, which was four hundred and thirty years after, cannot disannul, that it should make the promise of none effect.
18 For if the inheritance be of the law, it is no more of promise: but God gave it to Abraham by promise.
Now we know that Israel was the highway for the seed who was promised through Abraham. The Law of Moses was given 430 years after the covenant promise to Abraham. This means the Law had no effect on his covenant. It remained in effect after the Law.
"the law? It was added (to the Abraham Covenant as an addendum) because of transgressions, till the seed should come to whom the promise was made" V 19
The purpose of the Law was complete when Jesus came.
God bound himself with an oath to the Abrahamic covenant.
He 6:17 Wherein God, willing more abundantly to shew unto the heirs of promise the immutability of his counsel, confirmed it by an oath:
18 That by two immutable things, in which it was impossible for God to lie, we might have a strong consolation, who have fled for refuge to lay hold upon the hope set before us:
