1 Peter 3 20who once were disobedient, when the patience of God kept waiting in the days of Noah, during the construction of the ark, in which a few, that is, eight persons, were brought safely through [the] water. 21Corresponding to that, baptism now saves you-- not the removal of dirt from the flesh, but an appeal to God for a good conscience-- through the resurrection of Jesus Christ, 22who is at the right hand of God, having gone into heaven, after angels and authorities and powers had been subjected to Him
In your simplistic view this is proof that water saves a person. That is far however from what Peter is saying according to several Greek scholars.
Peter uses baptism in water showing that it is a representation of salvation just as Noah and his family escaping through water was a representation of salvation. Noah and his family weren't saved from hell by a boat ride any more than we are by being submerged in water.Their salvation was a representation in the physical,just like water baptism is a representation in the physical.They were saved from the physical by water.
Peter goes on to confirm this with his statement that baptism doesn't cleanse the filthy flesh in a literal sense,or in the metaphorical sense as cleansing for the soul,but what is necessary Peter says is a good conscious toward God accomplished by the Resurrection of Jesus Christ.
