Circumcision By Baptism
Under the Old Testament systems in the Patriarchal and Mosaic covenants, there was a sign instituted between God and Abraham that would show who truly belonged to God. This sign was called circumcision and was instituted by God, because no man would ever have thought of this.
and you shall be circumcised in the flesh of your foreskins, and it shall be a sign of the covenant between Me and you. (Genesis 17:11 NKJV)
But circumcision is no longer a requirement today. It has been replaced by baptism (amen) as stated by the Apostle Paul in the Letter to the Colossians chapter 2.
In Him you were also circumcised with the circumcision made without hands, by putting off the body of the sins of the flesh, by the circumcision of Christ, buried with Him in baptism, in which you also were raised with Him through faith in the working of God, who raised Him from the dead. (Colossians 2:11, 12 NKJV)
In former times, circumcision was a sign between man and God, but under the New Covenant, it is that and so much more! For Abraham, the circumcision of the flesh occurred after faith, so Romans 4:9-12 says he was justified by faith before the circumcision happened. But in baptism, the saving faith by which one is justified before God happens simultaneously with immersion.
For he is not a Jew who is one outwardly, nor is circumcision that which is outward in the flesh; but he is a Jew who is one inwardly; and circumcision is that of the heart, in the Spirit, not in the letter; whose praise is not from men but from God. (Romans 2:28, 29 NKJV)
So now, instead of a sign on our flesh, God uses baptism to mark or hearts permanently as His. This is a mark that only God can see. Someone can say they have the mark, but only God knows if they are true or not. At is why their praise is from God, and why we need to be satisfied with little or no praise and recognition from men. We must learn that only God’s approval matters in the end.
When people witness our baptism, they are not just watching as a soul is saved. They are seeing a circumcision take place. By salvation being a public thing, we are telling all who see it that we desire to be in covenant relationship with Jesus. Like it said in Colossians 2, as we participate in the death, burial and resurrection at baptism, we enter into the covenant that His blood was shed to inaugurate for us. And because of the faith we have in the “operation of God” that is transferring us from the kingdom of darkness to the Kingdom of the Son, our faith and obedience combine to spiritually mark us and set us apart for God.