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Dee said,

So now my question is... do you think the Lord intended for baptism to be performed on infants? Circumcision was mandated to be done at 8 days of age, but as far as I can see there's no mention of age for baptism in scripture. I ask because if I were to have kids any time soon, with my husband in the state he's in I'm 99% positive he will put his foot down about the child being baptized. Not on doctrinal grounds, but because he's against religion of all forms. And I know the Lutheran contingent in my life will raise a roar about it. Would I actually be sinning by not having any child of mine baptized at birth?
Most definitely I believe God meant for us to perform baptism on infants. If there is continuity in the covenants here then I would not expect to see specific instruction in the Bible in this area. Think about the argument from silence: What Jew would desire to be in a “new” and “better” covenant (Heb. 8:6) that was worse then their former covenant – not including their children. There would have been an uproar – a Circumcision Council if you please – had such a situation arisen. I also note that in 1 Cor 7:14 a child is considered to be holy (not saved, but set apart) because they are in the covenant. If in the covenant what is their sign and seal – baptism.

Baptism was foreseen as the covenant sign in the OT. Its meaning was developed throughout the OC. Our first parent was brought forth from so-called covenantal waters (Gen. 2:6-7; all the earth is under God’s law), Noah’s family (both lost and saved) was baptized (1 Pet. 3:20-21), and all Israel in the exodus (both lost and saved) was baptized (1 Cor. 10:1-2). We could go with more OT studies and see the "sign" developed in Naaman's baptism (2 Kings 5:14, dipped, symbolizing purity in the Lord), Isaiah’s baptism (Isa. 21:3-4; see the LXX (baptizo) – experiencing the final judgment of God upon Babylon and its sin, Isaiah says 'he was baptized in horror.' He was utterly overwhelmed by the sense of God's righteous judgment upon sin, but even in the midst of this there is glimmer of hope represented in the picture of the travail that will break forth), and Ezekiel's baptism (Ezek 23:15; see the LXX – dyed, baptism and union – dye makes union with cloth and thus symbolizing something old becoming something new – symbolizing born again). Christ, the second man Adam, introduced his ministry at his baptism (Matt. 3). Thus, we see that circumcision was only meant to be a temporary sign (long one, but still temporary) leading to the permanent sign (baptism in the final administration of God’s covenant).

As far as it being sin – yes it is sin. – Exodus 4:24 ff. You will have to approach this issue cautiously but justly with your husband – in much prayer. (compare 1 Cor. 7).