philip: ... infants don't understand their sin, don't understand or know the Gospel, can't choose to have faith in what they do not yet know, nor have the ability to respond to. So baptizing an infant - whether with a sprinkle or by being tossed in a pool - will not save that child.
Essential: so two questions here ...
#1 who does the baptizing in your / any baptismal need ... scenario ?
It is true that one is baptized into the Spirit by GOD. But other than the one doing the Baptism be a Christian, it matters not who physically facilitates the immersion or sprinkling. I baptized my oldest son. My youngest was baptized by the pastor. But both of these were only outward signs of what was in their understandings and heart: That Jesus is their Savior whom they have faith in and desire to serve. The ceremony was only an outward sign of what was within their understandings and hearts, not as a portal to, salvation.
Philip: No one can do for another human being what he must only do himself
Essential: #2 where do the babies who never get to Hear, understand and believe the Gospel message, and have faith in Christ. Period! end up after death?
My belief, and while not explicit, is there is good Scriptural evidence to suggest that children before an understanding of the Gospel, of their sin, of God's directive to believe/have faith in Jesus, cannot do these things. And so God doesn't demand of children (or the severely mentally handicapped, etc.) that which they cannot intellectually understand and thus cannot do. And so, I believe, if they die as children without such understandings, that they go to be with the Lord - and they may still in fact have to acknowledge and accept Jesus when made aware, or maybe they are merely saved by the Lord. Again, ADULTS whom were baptized as children, but yet who still lack faith in Christ, are just as dead in their sins as any other unbeliever. If mere BAPTISM saved, one could believe anything or nothing, and they would eternally be just fine. But that is not what Scripture teaches.