The Circumcision generally refers to the jews Abraham's physical seed. Thats who it is here in these places
Acts 10:45
[FONT="]And they of [/FONT]the circumcision which believed were astonished, as many as came with Peter, because that on the Gentiles also was poured out the gift of the Holy Ghost.
Rom 3:30,4:9
[FONT="]Seeing it is one God, which shall justify [/FONT]the circumcision by faith, and uncircumcision through faith.
[FONT="]Cometh this blessedness then upon [/FONT]the circumcision only, or upon the uncircumcision also? for we say that faith was reckoned to Abraham for righteousness.
Gal 2:9
[FONT="]And when James, Cephas, and John, who seemed to be pillars, perceived the grace that was given unto me, they gave to me and Barnabas the right hands of fellowship; that we should go unto the heathen, and they unto [/FONT]the circumcision.
However in the text of Phil 3:3 it doesn't apply to Abrahams physical seed , but to his spiritual seed in Christ which does include some of his physical seed, but also includes a multitude of gentiles.
The Circumcision spoken of in Phil 3:3 isnt connected at all to physical circumcision the jews were accustomed to, but a spiritual circumcision of the heart by the Spirit of God Rom 2:28-29
[FONT="]28 For he is not a Jew, which is one outwardly; neither is that circumcision, which is outward in the flesh:[/FONT]
[FONT="]29But he is a Jew, which is one inwardly; and circumcision is that of the heart, in the spirit, and not in the letter; whose praise is not of men, but of God.
This type circumcision has absolutely nothing to do with Jewish ethnicity. Neither does this being called a Jew in Rom 2:29 has anything to do with physical Jewish ethnicity, no more than it does being born a Egyptian.
A Born Again Egyptian is a Jew no less than a Born Again Jew as Paul was. We are speaking here of Spiritual things revealed in the Word of God ![/FONT]