Romans 4:11

11. Father of all Great was the reverence in primitive ages for paternity, and great was the name of Father. From the purely corporeal paternity the name was applied to any great founder, inventor, or model character, whose eminence attracted a retinue of followers, who became as their children. Jabal was father of all tent-dwellers, and Jubal was father of all harpers and organists. (Genesis 4:20-21.) So Abraham was held by the Jews as father of the whole Church of the faithful. One of their writers quoted by Schoettgen (Jalkut Chadash) says: “On this account Abraham was not circumcised until he was ninety-nine years old, lest he should shut the door on proselytes coming in.” Physical descent was not necessary in any age in order that a true believer should be reckoned among Abraham’s sons. While the Jewish Church stood, the Gentile world could enter into this sonship of Abraham by faith, of which circumcision was but the external sign. And now Paul preached that the Gentile world shall enter in by faith, endorsed by a simpler sign, baptism, and a lighter ritual, the supper. And of this new universal Church, in which Jew and Gentile distinctions no longer exist, the ancient father still is Abraham.

Not circumcised As circumcised, he was spiritual as well as corporeal father of the Jews; as uncircumcised, yet justified, he was spiritual father of faithful Gentiles.