As promised, I’ve begun to fill out my reasons for paedobaptist convictions  below….

1. The continuity of the Old and New Covenants in redemptive history

As passages like Galatians 3, for example, make clear, the New Testament understands salvation in Christ to be the fulfillment of the Abrahamic Covenant.

In Gal. 3:16 Paul writes, “Now the promises were made to Abraham and to his offspring. It does not say, “And to offsprings,” referring to many, but referring to one, “And to your offspring,” who is Christ.” Jesus and the New Covenant he inaugurates is the fulfillment of the Abrahamic covenant.  Then, in verses 26-29 Paul elaborates on how that Abrahamic covenantal promise benefits us,

 ”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 neither male nor 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.”

Those who are saved in the New Covenant do so as heirs of the Abrahamic covenant. The former is the fulfillment of the latter. And note in verse 27 the significant place of baptism as the sign of covenant membership.

2. The continuity of the way of salvation in the Old and New Covenants

“Abraham believed God and it was credited to him as righteousness”.  The saints were saved then, as now, by grace alone through faith alone in Christ alone. We ought to expect that the means of grace, by which “Christ communicateth to us the benefits of redemption” (Shorter Catechism 88), while differing in external form in the various covenant administrations, will nonetheless cohere with this single covenantal plan of salvation, and stand in basic continuity of meaning with one another.

3. The continuity of the people of God in the Old and New Covenant

As Ephesians 2:11-22 makes clear those who come to Christ in the New Covenant are one with the covenant people of God across the ages:

  ”Therefore remember that at one time you Gentiles in the flesh, called “the uncircumcision” by what is called the circumcision, which is made in the flesh by hands-  remember that you were at that time separated from Christ, alienated from the commonwealth of Israel and strangers to the covenants of promise, having no hope and without God in the world. But now in Christ Jesus you who once were far off have been brought near by the blood of Christ….  

So then you are no longer strangers and aliens, but you are fellow citizens with the saints and members of the household of God,  built on the foundation of the apostles and prophets, Christ Jesus himself being the cornerstone, in whom the whole structure, being joined together, grows into a holy temple in the Lord.  In him you also are being built together into a dwelling place for God by the Spirit.”

As 1 Peter:1:1 thinks of the church, it is comprised of distinctly Jewish sounding “pilgrims of the dispersion”. Later in 2:9-10, he says that the church is a,

“chosen generation, a royal priesthood, a holy nation, His own special people, that you may declare the praises of Him who called you out of darkness into his marvellous light; who once were not a people but are now the people of God, who had not obtained mercy but now have obtained mercy.”

We might also point to Romans 11:17 which describes the salvation of the gentiles in the New Covenant in terms of our in-grafting, as wild olive branches, into the cultivated tree of Israel.

God’s people are not two diverse and loosely related entities under the Old and New Covenant’s but are one. Membership in both the New Covenant and Old Covenant ekklesia is on the same basis, and the signs of such membership ought to be administered to all those who belong to the people of God.

4. The continuity of the spiritual reality signified in the sacraments of the Old and New Covenants (and…) 

5. The consequent  continuity in the function of the Old and New Covenant sacramental signs

Colossians 2:11-12 says,

 ”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.”

Paul tells us there that the spiritual reality, called here “the circumcision of Christ”, that New Covenant believers possess is “the putting off the body of the flesh”. That is, the spiritual reality known as circumcision of the heart in the Old Covenant (Deut. 10:16, 30:6; Jer. 4:4) is something enjoyed by believers in the New.  The outward sign that points to that inner reality of spiritual circumcision is baptism, “Being buried with him through baptism…”

The function served formerly by circumcision (the outward sign under the Old Covenant that pointed to the inner reality of circumcision of the heart) is now served by baptism. We no longer need to be circumcised, Paul is saying, because we have the reality circumcision pointed to, only now that reality is signified by baptism, and the dominant metaphor for the inner spiritual grace signified is no longer ‘the putting off the body of the flesh’ in a kind spiritual circumcision, but union with Christ in his death and resurrection.

So, that gets us to this far:

1. The covenants, people, and way of salvation in the Old and New Testaments stand in fundamental continuity and harmony. 

2. The sacramental signs, while differing in form, point to the same reality. Baptism now serves the role once served by circumcision.

Therefore, baptism takes the place of circumcision in the administration of the covenant. Just as the children of covenant members were circumcised so now they are baptised.