Abraham, has many sons. Abraham is the father of all who have faith in Christ.
Paul in Romans 4 speaks to gentile believers and tells them, Abraham is their father.
Becoming a child of the family of God for either Jew or Gentile is only by faith, not by natural birth, not by race or genes or descendants, not by family history, not by national identity, not by Jewishness.
Since Abraham is our Father, we are of the Israel of God.
John 1
10 He was in the world, and the world was made through Him, and the world did not know Him. 11 He came to His [
c]own, and His [
d]own did not receive Him. 12 But as many as received Him, to them He gave the [
e]right to become children of God, to those who believe in His name: 13 who were born,
not of blood, nor of the will of the flesh, nor of the will of man, but of God.
John 8
37
“I know that you are Abraham’s descendants, but you seek to kill Me, because My word has no place in you. 38 I speak what I have seen with My Father, and you do what you have [n]seen with your father.”
39 They answered and said to Him, “Abraham is our father.”
Jesus said to them, “
If you were Abraham’s children, you would do the works of Abraham. 40 But now you seek to kill Me, a Man who has told you the truth which I heard from God. Abraham did not do this. 41 You do the deeds of your father.”
Then they said to Him, “We were not born of fornication; we have one Father—God.”
42 Jesus said to them, “If God were your Father, you would love Me, for I proceeded forth and came from God; nor have I come of Myself, but He sent Me. 43 Why do you not understand My speech? Because you are not able to listen to My word. 44 You are of
your father the devil, and the desires of your father you want to do. He was a murderer from the beginning, and does not stand in the truth, because there is no truth in him. When he speaks a lie, he speaks from his own
resources, for he is a liar and the father of it. 45 But because I tell the truth, you do not believe Me. 46 Which of you convicts Me of sin? And if I tell the truth, why do you not believe Me? 47 He who is of God hears God’s words; therefore you do not hear, because you are not of God.”
Abraham Justified by Faith - What then shall we say that Abraham our father has found according to the flesh? For if Abraham was justified by works, he has something to boast about, but not before God. For what does the Scripture say? “Abraham believed God, and it was accounted to him for...
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What then shall we say that Abraham our father[a] has found according to the flesh? 2 For if Abraham was justified by works, he has
something to boast about, but not before God. 3 For what does the Scripture say? “Abraham believed God, and it was [
b]accounted to him for righteousness.” 4 Now to him who works, the wages are not counted [
c]as grace but as debt.
David Celebrates the Same Truth
5 But to him who does not work but believes on Him who justifies the ungodly, his faith is accounted for righteousness, 6 just as David also describes the blessedness of the man to whom God imputes righteousness apart from works:
7 “Blessed
are those whose lawless deeds are forgiven,
And whose sins are covered;
8 Blessed
is the man to whom the Lord shall not impute sin.”
Abraham Justified Before Circumcision
9
Does this blessedness then
come upon the circumcised
only, or upon the uncircumcised also? For we say that faith was accounted to Abraham for righteousness. 10 How then was it accounted? While he was circumcised, or uncircumcised? Not while circumcised, but while uncircumcised. 11 And he received the sign of circumcision, a seal of the righteousness of the faith which
he had while still uncircumcised, that he might be the father of all those who believe, though they are uncircumcised, that righteousness might be imputed to them also, 12 and the father of circumcision to those who not only
are of the circumcision, but who also walk in the steps of the faith which our father Abraham
had while still uncircumcised.
The Promise Granted Through Faith
13 For the promise that he would be the heir of the world
was not to Abraham or to his seed through the law, but through the righteousness of faith. 14 For if those who are of the law
are heirs, faith is made void and the promise made of no effect, 15 because the law brings about wrath; for where there is no law
there is no transgression.
16 Therefore
it is of faith that
it might be according to grace, so that the promise might be [
d]sure to all the seed,
not only to those who are of the law, but also to those who are of the faith of Abraham, who is the father of us all 17 (as it is written, “I have made you a father of many nations”) in the presence of Him whom he believed—God, who gives life to the dead and calls those things which do not exist as though they did; 18 who, contrary to hope, in hope believed, so that he became the father of many nations, according to what was spoken, “So shall your descendants be.” 19 And not being weak in faith, he did not consider his own body, already dead (since he was about a hundred years old), and the deadness of Sarah’s womb. 20 He did not waver at the promise of God through unbelief, but was strengthened in faith, giving glory to God, 21 and being fully convinced that what He had promised He was also able to perform. 22 And therefore “it was accounted to him for righteousness.”
23 Now it was not written for his sake alone that it was imputed to him, 24 but also for us. It shall be imputed to us who believe in Him who raised up Jesus our Lord from the dead, 25 who was delivered up because of our offenses, and was raised because of our justification.