...
there is nothing here that suggests that infants should not be baptised. More to the point, there is nothing here that requires "belief" in advance of "either baptism".
The fundamental, and as yet unanswered challenge to those who reject infant baptism is this: where, specifically, does the Scripture require belief in advance of baptism?
You remain in error my friend - Jesus was clear - belief
precedes baptism and both belief and baptism take place before one "shall be saved".
Whoever believes and is baptized will be saved, but whoever does not believe will be condemned. (Mark 16:16 ESV)
One who does not believe prior to baptism simply gets wet. One who believes, repents and is baptized has his/hers sins remitted by the blood of Christ.
And Peter said to them, "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. (Acts 2:38 ESV)
The biblical and historical truth remains - infants were not baptized in the apostolic church because infants do not have the mental maturity to "obey from the heart the gospel once delivered".
But thanks be to God, that you who were once slaves of sin have become obedient from the heart to the standard of teaching to which you were committed, (Romans 6:17 ESV)
Again these facts remain true - (1) infant baptism is not found in the N.T; (2) infant baptism is not to be held as an apostolic ordinance; (3) infant baptism encountered early and long resistance in the Lord's church for the obvious reasons; and (4) infant baptism did not become common practice until after the time of Augustine - much too late for apostolic sanction.
The one who has been baptized/sprinkled as an infant has not been scripturally baptized and needs to submit to God's ordinance. Baptism requires a
decision on the part of the one to be baptized as he/she
chooses to obey his Lord. Infants who were baptized at the instruction of their parents have not made that decision - they have not willingly obeyed the Lord's command to be baptized in water. The advice today to those who were only baptized as infants is the same advise given to Paul...
And now why do you wait? Rise and be baptized and wash away your sins, calling on his name.' (Acts 22:16 ESV)