It the Abrahamic Covenant from its first revelation to Abraham was international in scope and unconditional Gen 12:1-3
Now the Lord had said unto Abram, Get thee out of thy country, and from thy kindred, and from thy father's house, unto a land that I will shew thee:
2 And I will make of thee a great nation, and I will bless thee, and make thy name great; and thou shalt be a blessing:
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.
All the families of the Earth is international
fulfilled Rev 5:9
And they sung a new song, saying, Thou art worthy to take the book, and to open the seals thereof: for thou wast slain, and hast redeemed us to God by thy blood out of every kindred, and tongue, and people, and nation;
Your error is in taking "nations" and "families of the earth" as referring to non-Hebrews. The covenant is between God and Abram the Hebrew (Gen. 14:13), and Abram's Hebrew seed through Isaac then Jacob and to Jacob's twelve sons. There also exists Ishmael and Esau, and after Sarah's death, Ketura, who born other children with Abram and in time became the fulfillment of those "families of the earth" along with the generations after the twelve sons of Jacob. Since God promised to make Abram's name great and to enlarge his seed as countless as the stars in the heavens and as countless as the sand on the seashore, it is only right that "families of the earth" refer to Abram's seed and the great many families that will come out of Abram through the various births to come into existence in his family. "Families of the earth" is only a natural extension of the seed of Abram that God multiplies on the earth and the blessings that will be upon them by virtue of being his seed. The subject is Abram. The context is his seed. And the realization is that in making his name great is accompanied by those families that will be born to him in time.
2 And I will make my covenant between me and thee, and
will multiply thee exceedingly. Genesis 17:1–2.
4 As for me, behold, my covenant is with thee, and
thou shalt be a father of many nations.
5 Neither shall thy name any more be called Abram, but thy name shall be Abraham;
for a father of many nations have I made thee. Genesis 17:4–5.
the above "have I made thee" is spoken in the past tense as though these families and nations already exist.
6 And I will make thee exceeding fruitful, and I will make nations
of thee, and kings
shall come out of thee.
Genesis 17:6.
"Nations" and "kings" do not refer to Gentiles for the declaration is that these "nations" and "kings" will be "of thee" and "come out of thee." These do not refer to Gentiles for Gentiles do not come from the loins of Abram. Non-Hebrew Gentiles cannot be born of two Hebrew parents. It is illogical and impossible. It's like saying that am Chinese can be born from two Spanish parents. Non-Hebrews were already in existence at the time of this covenant and they were born from Ham and Japheth.
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.
9 And God said unto Abraham, Thou shalt keep my covenant therefore, thou,
and thy seed after thee in their generations.
10 This is my covenant, which ye shall keep,
between me and you and thy seed after thee; Every man child among you shall be circumcised.
11 And ye shall circumcise the flesh of your foreskin; and
it shall be a token of the covenant betwixt me and you.
Genesis 17:9–11.
15 And God said unto Abraham, As for Sarai thy wife, thou shalt not call her name Sarai, but Sarah shall her name be. 16 And
I will bless her, and give thee a son also of her: yea, I will bless her, and
she shall be a mother of nations; kings of people shall be of her. Genesis 17:15–16.
"Shall be of her" again restricts this covenant as being between God, Abram the Hebrew (Gen. 14:13), and Abram's Hebrew seed with Sarah who is also Hebrew. Two Hebrew parents cannot birth a non-Hebrew (Gentile) child. Impossible.
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.
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.
We begin to see the promise of "families of the earth" become identified through Ishmael who is mixed race but that he will birth twelve sons who are princes and later to be "kings" as promised by God above. "Nations" begin to come into view and these nations will be born of Ishmael through Ishamel and through his twelve sons who are identified as the "families of the earth" promised above.
21 But
my covenant will I establish with Isaac, Genesis.17:21.
The "families of the earth" God promised to bless are already identified as generation of births through Ishmael and Isaac. From Isaac, Jacob is born and Jacob births twelve sons just as Ishmael. Already we see these "families of the earth" already being born of Abram's seed through Sarah and 24 heads of families between both Abram's sons: Isaac and Ishmael. These "families of the earth" are the seed of Abram, NOT Gentiles.
