Circumcision and the New Covenant
Among the Israelites, circumcision was designated a “sign” -- an indication in the flesh of Jewish males denoting a special covenant relationship with God:
Genesis 17:10-11: This is My covenant, which you shall keep, between Me and you and your descendants after you: every male among you shall be circumcised. And you shall be circumcised in the flesh of your foreskin, and it shall be the sign of the covenant between Me and you.
There are indications that it also may have been instituted to suggest the entire nation’s need for sexual purity and the avoidance of pagan worship. However, when practiced without an attendant sincerity of heart and faithful obedience to God, the ritual was rendered worthless:
Deuteronomy 30:6: Moreover the LORD your God will circumcise your heart and the heart of your descendants, to love the LORD your God with all your heart and with all your soul, so that you may live.
Jeremiah 4:4: Circumcise yourselves to the LORD
And remove the foreskins of your heart,
Men of Judah and inhabitants of Jerusalem,
Or else My wrath will go forth like fire
And burn with none to quench it,
Because of the evil of your deeds.
During Stephen’s elaboration to the faithless Jews of his day that they were “uncircumcised in heart and ears,” he was essentially charging that they were "uncircumcised" and pagan in disposition:
Acts 7:51: You men who are stiff-necked and uncircumcised in heart and ears are always resisting the Holy Spirit; you are doing just as your fathers did.
In the New Testament, there is a strong sense in which circumcision symbolized baptism. Just as the Jewish rite involved a severing of the flesh, similarly, when someone is immersed in water, they wash away the old, sinful person (are severed from it), and become a new creation in Christ, one without spot or blemish:
1 Peter 3:21: Corresponding to [Noah's baptism in the Flood], baptism now saves you — not the removal of dirt from the flesh, but an appeal to God for a good conscience — through the resurrection of Jesus Christ (Emphasis added).
Col. 2:11-12: [And] in Him you were also circumcised with a circumcision made without hands, in the removal of [sin from] the body of the flesh by the circumcision [water immersion in] Christ; having been buried with Him in baptism [baptism is a death, burial, and resurrection], in which you were also raised up with Him through faith in the working of God, who raised Him from the dead. (Emphasis added.)
Circumcision was integral to the Old Covenant relationship with God, one which has been abolished after being nailed to the cross:
Colossians 1:13b-14: He made you alive together with Him, having forgiven us all our transgressions, having canceled out the certificate of debt consisting of decrees against us, which was hostile to us; and He has taken it out of the way, having nailed it to the cross.
That should be as striking a reminder as any that the Law of Moses, the Old Covenant, has been superseded by the New Covenant of Christ, and that baptism is now our "circumcision" into Christ.
 See ChristianCourier.com.