For it is we who are the circumcision, we who serve God by his Spirit, who boast in Christ Jesus, and who put no confidence in the flesh, though I myself have reasons for such confidence. If someone else thinks they have reasons to put confidence in the flesh, I have more: circumcised on the eighth day of the people of Israel, of the tribe of Benjamin, a Hebrew of Hebrews; in regard to the law, a Pharisee; as for zeal, persecuting the church; as for righteousness based on the law, faultless.

Philippians 3:3-6

Who is the true circumcision? Those who worship in the Spirit of God, who glory and boast in Christ alone, and who do not place any confidence in what human flesh can do to please God. In what ways was Paul ahead of most men in fleshly religious efforts, having more reason to put confidence in the flesh?

“Paul was:'”
Circumcised on the eighth day as a baby.
Of the race of Israel, of the tribe of Benjamin, a Hebrew of the Hebrews.
According to the Law of Moses, a Pharisee.
According to zeal, a persecutor of the churches of Christ.
Blameless in terms of the righteousness that comes from observing the Law of Moses.