1) No compelling Biblical argument demonstrating baptism replaces circumcision.
Read Col. 2 carefully and the comparison is between circumcision of the flesh and the spiritual circumcision done at regeneration.
“In him also you were circumcised with a circumcision made without hands, by putting off the body of the flesh, by the circumcision of Christ, 12 having been buried with him in baptism, in which you were also raised with him through faith in the powerful working of God, who raised him from the dead.” (Colossians 2:11–12, ESV)
Everything in that passage pertains to salvation.
Baptism is unlike circumcision in many ways:
- Is not male only
- Is not done on the 8th day for infants
- Is not applied to household servants or slaves of believing masters
- Does not involve the cutting of flesh
Additionally, Paul makes it clear that Jesus is the fulfillment of the “offspring” promise to Abraham. Physical offspring do not have the same significance under the New Covenant as it did under the Abrahamic. Any connection to the Abrahamic Covenant is through spiritual union with Christ and not physical descent.
If you read carefully Paul’s argument in Galatians 3:15-28, you will notice some important connections between the Abrahamic covenant, Jesus, and baptism. This would be the perfect place for Paul to clearly teach that baptism replaces circumcision, especially in light of the circumcision controversy in the church. However, he never does that, ever. Instead, we get this statement at the end of the passage:
“But now that faith has come, we are no longer under a guardian, 26 for in Christ Jesus you are all sons of God, through faith. 27 For as many of you as were baptized into Christ have put on Christ. 28 There is neither Jew nor Greek, there is neither slave nor free, there is no male and female, for you are all one in Christ Jesus. 29 And if you are Christ’s, then you are Abraham’s offspring, heirs according to promise.” (Galatians 3:25–29, ESV)
There is just no room at all for infant baptism anywhere in his argument in my opinion. It is all about union with Christ through faith.
Seems to me the better OT comparison with baptism is ceremonial washings but I would need to do some more work on that one.
2) The pattern given at the beginning of Acts is repent, faith in Jesus (implied from context) and be baptized, those things all go together:
“Repent and be baptized every one of you in the name of Jesus Christ for the forgiveness of your sins, and you will receive the gift of the Holy Spirit. 39 For the promise is for you and for your children and for all who are far off, everyone whom the Lord our God calls to himself.” (Acts 2:38–39, ESV)
Notice the three groups mentioned - you, your children, and those far off - are summarized as “everyone who God calls to Himself.” I believe this is the call of salvation as the context seems to demand and not a general, non-salvific call. The promise in v.39 is the forgiveness of sins and the gift of the Holy Spirit mentioned in v.38 (remember the context of the passage is the pouring out of the Spirit at Pentecost and Peter answering the criticism of the crowds for speaking in foreign languages). That gift is for the elect alone.
When it comes to the household baptisms in Acts, there is no indication that the pattern of repent, believe, and be baptized is altered to make allowance for unbelieving infants. Can entire households come to saving faith at the same time? Of course, over 3,000 men came to faith at the same time at Pentecost. There is no reason to assume the same thing isn’t happening in the household baptism accounts. There also is not any indication infants were baptized at Pentecost so why assume they were later on in the book?
“And with many other words he bore witness and continued to exhort them, saying, “Save yourselves from this crooked generation.” 41 So those who received his word were baptized, and there were added that day about three thousand souls.” (Acts 2:40–41, ESV)
At Pentecost, it is clear that only those who responded to Peter’s preaching were baptized, not their children!
3) The Great Commission:
“All authority in heaven and on earth has been given to me. 19 Go therefore and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, 20 teaching them to observe all that I have commanded you. And behold, I am with you always, to the end of the age.” (Matthew 28:18–20, ESV)
Why would adult believers be baptized in the name of the Triune God but then knowingly baptize unregenerate children in that same name? If one is consistent in their soteriology, I don’t see any reason at all to presume all children of believers will be saved. The only justification I have heard for doing this is the assumption that baptism is operating in the same manner as circumcision. However, if baptism is not the New Covenant sign of circumcision, then the justification for baptizing infants seems to vanish.
4) Peter’s teaching on baptism in the difficult 1 Peter 3:18-22 passage:
“For Christ also suffered once for sins, the righteous for the unrighteous, that he might bring us to God, being put to death in the flesh but made alive in the spirit, 19 in which he went and proclaimed to the spirits in prison, 20 because they formerly did not obey, when God’s patience waited in the days of Noah, while the ark was being prepared, in which a few, that is, eight persons, were brought safely through water. 21 Baptism, which corresponds to this, now saves you, not as a removal of dirt from the body but as an appeal to God for a good conscience, through the resurrection of Jesus Christ, 22 who has gone into heaven and is at the right hand of God, with angels, authorities, and powers having been subjected to him.” (1 Peter 3:18–22, ESV)
Leaving aside the Noah reference, everything about baptism here relates to salvation including the “appeal to God for a good conscience” and Jesus dying to redeem people and bring them to God. Again, there is no room here to smuggle in another category of baptism recipients (those who we know are not yet redeemed - unregenerate infants).
5) Baptism and the Lord’s Supper are New Covenant signs for the same group of people, those who profess to have faith in Christ and are part of the New Covenant. It would take more work to explain this but I am away from home on a mobile device and it has already taken a long time to type all this (if you are in Gray, I am typing this not far from you as I am actually in Jonesborough TN at the moment

).