Gen 12 - in you shall all the families of the earth be blessed.
Gentiles are the focus of the salvic portion of the covenant. God through Abrahams seed (Christ) will be a blessing to the world
Stay in context. And it is a very weak argument to identify "all the families" as God identifying non-Hebrew Gentiles". I asked for ANYONE to provide a Scripture in the Old Testament Hebrew Scripture of God making a covenant with (non-Hebrew) Gentiles and not only are there no Scriptures that records God making a covenant with Gentiles, but no one can tell me this Gentile's name God supposedly made covenant with. In Genesis 14:13 God identifies Abram as Hebrew (of the family of Eber.) Where does God choose out a Gentile, identify him as Gentile, and then declare a covenant between God and this Gentile and his Gentile seed?
3 And I will bless them that bless thee, and curse him that curseth thee: and
in thee shall all families of the earth be blessed. Genesis 12:3.
"In thee" refers to his (Abram's) biological families that will be born in time. As we read on in Scripture, we see Ishmael and later, Esau, are Abraham's descendants and were also blessed of God. The covenant is between God, Abram the Hebrew, and Abram's Hebrew seed.
7 And
I will establish my covenant between me and
thee and thy seed after thee in their generations for an everlasting covenant, to be a God unto thee,
and to thy seed after thee. Genesis 17:7.
And because God knew that non-Hebrew Gentiles would try to steal the covenant He made with Abram and to steal Israel's inheritance, God says it again who is in this covenant:
10
This is my covenant, which
ye shall keep,
between me and
you and thy seed after thee; Genesis 17:10.
and again:
2 And I will make
my covenant between me and
thee, and will multiply thee exceedingly. Genesis 17:2.
and again:
4 As for me, behold,
my covenant is with thee, and thou shalt be a father of many nations. Genesis 17:4.
and again:
... and
my covenant shall be
in your flesh for an everlasting covenant. Genesis 17:13.
Then God identifies out of the two sons of Abraham to be born which one possesses the covenant and its blessings, and which possesses only the blessings and not the covenant.
19 And God said, Sarah thy wife shall bear thee a son indeed; and thou shalt call his name
Isaac: and
I will establish my covenant with him for an
everlasting covenant,
and with his seed after him. Genesis 17:19.
God then turns His attention to Ishmael:
20 And as
for Ishmael, I have heard thee: Behold,
I have blessed him, and will make him fruitful, and will multiply him exceedingly; twelve princes shall he beget, and
I will make him a great nation. Genesis 17:20.
God did say that through Abraham's seed nations and kings will be born from Abraham and Sarah. Ishmael is one example, Esau is another. Then there are Abraham's descendants that are not named in Scripture. They in their own right become a nation of people with some having a king to lead them just as Israel had kings to lead them (even if their leadership led the people into sin.)
God reiterates the line of succession with regard to the covenant and the blessings that accompany it.
21 But my covenant will I establish with Isaac, which Sarah shall bear unto thee at this set time in the next year. Genesis 17:21.
Then this meeting is over after God makes covenant with Abram the Hebrew and identifies all its particulars.
22 And he left off talking with him, and God went up from Abraham. Genesis 17:22.
AS FOR CHRIST, who is of the seed of Abram the Hebrew Christ is the outworkings of the Abraham Covenant and the Mosaic Covenant. Both these covenants remain between God and Abraham and Abraham's seed. There are no Gentiles named or included in either of these two covenants. Their history and the history of the people of God are recorded in the Hebrew Scripture, from Genesis to Malachi. And in these "books" of their Bible Gentiles are the enemy of God and Israel. There is nothing in these writings where God makes any kind of covenant with Gentiles. In fact, this is the attitude of God towards these uncircumcised, non-covenant, idol-worshiping Gentiles whom He hates:
17 All nations before him are as
nothing;
And they are counted to him
less than nothing,
and vanity.
Isaiah 40:17.
When Jesus Christ arrived, He was the fulfillment of many prophecies about Him, one is found in the Law of Moses:
15 The LORD thy God will raise up unto thee a Prophet
from the midst of thee, of thy brethren, like unto me; unto him ye shall hearken; Deut. 18:15.
and
18 I will raise them up a Prophet
from among their brethren,
like unto thee, and will put my words in his mouth; and he shall speak unto them all that I shall command him. Deut. 18:18.
When Jesus did arrive, He was born to a Hebrew girl/woman, named Mariam/Mary. Mariam was the name of Moses' sister. As Jesus grew up and began His Ministry to the Hebrew people He fulfilled many prophecies and taught the people out of their Law, the Law of Moses. The conflict the religious leaders had with Jesus was simple: They taught the letter of the Law and Jesus came teaching the spirit of the Law. But it was the Law of Moses He taught. And because they were 'spiritually discerned' they could not understand the spirit of the Law unless Jesus Himself opened their minds to it. Apparently, Jesus opened the minds of both Nicodemus and Joseph of Arimathea, and later, Saul, Apollos, Epaphroditus, the twelve disciples, and others. In Matthew 5:17, Jesus says the following:
17
Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfil.
18
For verily I say unto you, Till heaven and earth pass, one jot or one tittle shall in no wise pass from the law, till all be fulfilled. Matthew 5:17–18.
Any change in the Law would destroy the Law. God's Word is a sure foundation. He doesn't lie. And through the centuries God has raised the Hebrews, protected them, fed them, defended them, chastised them, judged them, blessed them, etc.
And this is the fulfillment of the Law Jesus stated He came to fulfill:
In the Law God commanded the Hebrew people in the way He was to be worshiped. The Ceremonial Law lays out those instructions. In the Law, the high priest takes an animal, sacrifices that animal on an altar, and sprinkles the people with its blood. This was done yearly, and it is called "Yom Kippur." In these Laws God instructed the high priest to sacrifice an animal to atone for the sins of the Hebrew people for one year until the next Yom Kippur arrives, then the high priest would do it all over again, perpetually. Under the substitutionary sacrificial system God gave to the Hebrew people, Jesus Christ was sent as God's lamb whom God Himself would sacrifice to atone for the sins of the Hebrew people the same way that it was done under the Law, except God's atonement was one-time and forever.
Under the Law there is no record of the high priest ever leaving Israel, go to the Gentile nations that surrounded Israel, and offer sacrifices for their sins. This never happened. Neither did God nor Christ change the Law to atone for the sins of non-Hebrew Gentiles. Thus, under the Law, Jesus Christ died and was raised to atone for the sins of the Hebrew people. Thus, the Law was obeyed, maintained, and established as written except now through Jesus Christ, natural Olive tree Israel became spiritual Olive tree Israel, and the Promised Holy Spirit of God is given to the Hebrew people as prophesied by Joel and promised by God. If you read the prophecy by Joel, you will find the Spirit was promised to Israel and NOT to any non-Hebrew Gentiles, and one needs the Spirit to be born-again and saved.