1 Peter 3:18-22 (English Standard Version)
18) 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.
Which of those 8 people saved from the Flood did not believe God?
Which of those 8 people saved from the Flood did not climb aboard the Ark for themselves?
Which of those 8 people saved from the Flood was an infant saved because their parent believed God and carried them aboard the Ark?
Credobaptists believe that one enters the Church, the Body of Christ, in exactly the same way as those 8 people entered the Ark.
Are you sure that you do?