Romans 4:12............
"And the father of circumcision to them who are not of the circumcision only, but who also walk in the steps of that faith of our father Abraham, which he had being yet uncircumcised."
It should be noted, and I probably should have already stated this, but the Jews of Paul’s day thought circumcision meant they were the true descendants of Abraham. Paul insists that to have Abraham as your father, you must walk in the steps of the faith that Abraham walked in.
“Our father Abraham” is an important phrase, and one that the ancient Jews jealously guarded. They did not allow a circumcised Gentile convert to Judaism refer to Abraham as “our father” in the synagogue. A Gentile convert had to call Abraham “your father” and only natural born Jews could call Abraham “our father.” Paul throws out that distinction, and says that through faith, all can say, “our father Abraham.”
Can you imagine the shock for the Jewish readers of this letter to see that Paul called Abraham the father of uncircumcised people! !!!
Faith, not circumcision, is the vital link to Abraham. It is far more important to have Abraham’s faith (and the righteousness imputed to him because of it) than it is to have Abraham’s circumcision.
We read that today and say.........DUH! Common sense --right??? But remember, this was sent to believers in Rome 2000 years ago.
FAITH is what made Abraham a spiritual father to everyone who believes God without being circumcised, referring to all non-Jewish people, whether circumcised for other reasons or not.
Now Paul shows that Abraham was also the father of circumcised people, as well. However, in this case Paul is not referring to all of them. Abraham is, of course, physically the father of all the Jewish people. He is their primary ancestor. They are his descendants.
Paul, however, qualifies this second group of the children of Abraham.
He describes them as, yes, circumcised and Jewish, but also as those who walk in his footsteps by having the same faith in God Abraham did before he was circumcised. In other words, Abraham became the spiritual father both of the believing non-Jews and the believing Jews. Paul's point here is crucial: ......
even under circumcision, faith is what truly separates those who are in God's family from those who are apart from it. Abraham set the example for all who would follow in faith.