For we [Christians] are the true circumcision, who worship God in spirit and by the Spirit of God and exult and glory and pride ourselves in Jesus Christ, and put no confidence or dependence [on what we are] in the flesh and on outward privileges and physical advantages and external appearances- Philippians 3:3 (AMPC)
God gave circumcision to Abraham and his physical descendants as an outward physical sign representing and reminding them of an inward union and communion with Him that was by Faith.
Physical circumcision in itself has nothing at all to do with a person’s standing or relationship with God. We connect with God by Faith in His Son Jesus Christ. There’s nothing we can do to our physical bodies that gets us accepted by God.
We have access to God through Faith in Christ Jesus. Only in this manner are we changed inwardly as God Himself does the true circumcision of giving us a new heart, putting a new spirit in us; He removes from us our old hard, lifeless heart of stone and gives us a new, tender, living heart of flesh. Ezekiel 36:26
Therefore do not depend on what you do physically outwardly thinking it’s what your relationship with God is founded and built on. Our Salvation is found and built on Christ and His Redemptive Sacrifice for us. Heart Faith in that alone is the true circumcision that God recognizes and approves.