The Question of Abraham’s Fatherhood
Who are Abraham’s true children? Paul’s argument in Romans 4 raises a critical question: in what sense is Abraham the “father” of believers? If Abraham were simply the father of all his physical descendants, it cancels the need for qualification. The Jews already claimed Abraham as their father based on lineage—a claim challenged by John the Baptist. See Matthew 3:9.
However, Paul reframes the issue entirely.
Circumcision as a Sign—Not the Basis
Romans 4:11 states that Abraham received circumcision as a sign and seal of the righteousness he already possessed by faith while uncircumcised. This establishes a key principle. Circumcision did not make Abraham righteous. It confirmed a righteousness that preceded it.
Therefore, Abraham is not the father of all uncircumcised people indiscriminately, but specifically of those who believe.
Faith Defines Abraham’s True Seed
Moreover, the phrase “that he might be the father” introduces a purpose clause. It indicates that something had to occur for Abraham to become the father of believing Gentiles. Respectfully, that “something” cancels physical descent, but establishes faith.
Genesis 17:14 makes clear that uncircumcised males were cut off from the covenant. Yet Paul explains that through faith, those once outside the covenant could now be included. This inclusion is not based on flesh, but on participation in the same faith Abraham exercised. In this manner, he defines those who are Abraham’s true children.
The Role of the Law and Those Outside It
Later, Paul distinguishes between those under the Law (Israel) and those outside it (the uncircumcised). The latter existed not as part of the covenantal structure defined by the Law, yet they become heirs through faith in Christ.
This reinforces that covenant identity roots manifest not in ethnicity but in belief.
One Seed in Christ: Paul’s Argument in Galatians
Galatians 3:16 identifies Christ as the singular “seed” of Abraham. Verse 28 expands this to include all who are in Christ as one unified seed.
Thus, whether Jew or Gentile, inclusion in Abraham’s family is mediated through Christ—not through lineage.
Greek, Jew, Barbarian: Paul’s Global Categories
Further, in Colossians 3:11, Paul categorizes humanity as:
Greek and Jew
Circumcised and uncircumcised
Barbarian and Scythian
Slave and free
These characterize not internal divisions within Israel, but broad distinctions across humanity.
Why “Greek” Does Not Mean Israelite
The term “Greek” commonly defined non-Jews within the Hellenistic world. While “Gentiles” expressed the more comprehensive, “Greek” reflected the cultural dominance of Hellenism in the Mediterranean.
Moreover, this distinction shows that Paul addressed actual non-Israelite populations—not merely dispersed Israelites.
The Case of Titus and the Uncircumcised
Galatians 2:3 presents Titus, a Greek, who was not compelled to be circumcised. This demonstrates that Paul did not impose Jewish covenantal markers on Gentile believers.
Acts 21 and the Distinction Between Jews and Greeks
Acts 21:20–28 reveals a critical distinction. The apostles upheld the Law for Jewish believers, including those in the Diaspora, while explicitly not imposing it on Gentiles.
In addition, the accusation against Paul was not that he taught Jews to abandon the Law, but that he brought Greeks into the temple—an offense punishable by death. This only makes sense if Greeks were understood as distinct from Jews.
Conclusion: Christ as All and in All
Paul’s conclusion is definitive: “Christ is all and in all” (Colossians 3:11).
Ethnic, cultural, and covenantal distinctions do not determine inclusion in Abraham’s family. Faith in Christ does. It answers the question of who are Abraham’s children. He is the singular seed through whom all others count as heirs.
