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Salvation happens in the heart. The spiritual heart (not the physical one) is the key to understanding salvation. Circumcision, similar to baptism, is a picture of what happens to a saved person.
Physical Circumcision and Baptism do not Save a Person
The spiritual heart is invisible, internal to a person, and therefore only accessible by God. During physical circumcision, physical flesh is removed from the body. During Old Testament times, God used this sign to mark His people. Circumcision was simply a way to differentiate God’s people from other nations (though this does not mean that circumcision saves a person).
There are two Israels. There is the physical nation, which is God’s people of the Old Testament. And there is the spiritual nation, which is the true believers in Christ. Circumcision was a sign of faith, given to the physical nation, chosen by God over all other nations. Likewise, baptism is a sign of faith, given to the spiritual nation, those chosen by God out of all people.
Both circumcision and baptism take place after people become true believers. Their purpose is to publicly identify with Christ, not to save a person from sin. They are a sign of what has happened; they offer no value toward saving a person. They are a physical (external) sign of a spiritual (internal) reality.
Abraham was circumcised after his faith. Non-believing infants were circumcised and non-believers today can be baptized, but there is no reason to do this. NT believers are baptized only after the testimony of their faith. This is why Paul can argue that circumcision and uncircumcision mean nothing (Galatians 5:6).
For you are not a true Jew just because you were born of Jewish parents or because you have gone through the ceremony of circumcision. No, a true Jew is one whose heart is right with God. And true circumcision is not merely obeying the letter of the law; rather, it is a change of heart produced by the Spirit. And a person with a changed heart seeks praise from God, not from people.
Romans 2:28-29 NLT
Circumcision of the Heart Permanently Identifies a Person With Christ
To become a believer, Christ must perform a spiritual circumcision on the heart. He must cut away the sinful nature, causing the spiritual heart to come to life. Once done, the person’s union with Christ is complete and irreversible.
For in Christ lives all the fullness of God in a human body. So you also are complete through your union with Christ, who is the head over every ruler and authority. When you came to Christ, you were “circumcised,” but not by a physical procedure. Christ performed a spiritual circumcision—the cutting away of your sinful nature.
For you were buried with Christ when you were baptized. And with him you were raised to new life because you trusted the mighty power of God, who raised Christ from the dead. You were dead because of your sins and because your sinful nature was not yet cut away. Then God made you alive with Christ, for he forgave all our sins. He canceled the record of the charges against us and took it away by nailing it to the cross.
Collosians 2:9-14 NLT
Just like it is impossible for a man to become uncircumcised, it is impossible for a true believer in Christ, who has been spiritually circumcised in the heart, to return to spiritual death. The Christian who has been circumcised has had his physical nature cut away. It cannot be “glued back on.” The person who has become alive in Christ is fully identified with Christ. Just as Christ lives forever, so will the person whose record of charges has been crucified.
God resurrects His people to spiritual life. He will never then kill them, returning them to spiritual death. The Christian is a new creation in the sense that his heart is spiritually different than the non-believer’s. If you are saved, recognize your circumcised heart and rejoice in what God has done for you. God’s saving is a profound alteration that brings a person to such fullness of life that it can never die.
For further reading:
https://www.ligonier.org/learn/devotionals/circumcision-heart
https://www.desiringgod.org/messages/how-do-circumcision-and-baptism-correspond
https://christianconcepts.com/guard-your-heart-or-you-will-become-lost
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