But you are confusing that at 1 Peter 3:21 to be water baptism when it is not. That idea does not match the parallel with Noah's Ark and that flood.
Please listen as I explain how that parallel works:
Noah and seven others were transported in the Ark as risen above by water of a world which was perishing.
Parallel: Isaiah 57:20 "But the wicked are like the troubled sea, when it cannot rest, whose waters cast up mire and dirt."
Jesus arranged things to demonstrate how by faith in him we can rise to walk safely on the surface of even turbulent water, again to those who have spiritual discernment a picture of rising above this perishing world to safety through faith in Christ:
Matthew 14:22 "And straightway Jesus constrained his disciples to get into a ship, and to go before him unto the other side, while he sent the multitudes away.
23 And when he had sent the multitudes away, he went up into a mountain apart to pray: and when the evening was come, he was there alone.
24 But the ship was now in the midst of the sea, tossed with waves: for the wind was contrary.
25 And in the fourth watch of the night Jesus went unto them, walking on the sea.
26 And when the disciples saw him walking on the sea, they were troubled, saying, It is a spirit; and they cried out for fear.
27 But straightway Jesus spake unto them, saying, Be of good cheer; it is I; be not afraid.
28 And Peter answered him and said, Lord, if it be thou, bid me come unto thee on the water.
29 And he said, Come. And when Peter was come down out of the ship, he walked on the water, to go to Jesus.
30 But when he saw the wind boisterous, he was afraid; and beginning to sink, he cried, saying, Lord, save me.
31 And immediately Jesus stretched forth his hand, and caught him, and said unto him, O thou of little faith, wherefore didst thou doubt?
32 And when they were come into the ship, the wind ceased.
33 Then they that were in the ship came and worshipped him, saying, Of a truth thou art the Son of God."
Jesus' body compares to that Ark Noah built. When we become a part of the body of Christ (his church) it is as being inside that Ark that Noah built being carried over the top of the turbulent waters of wicked mankind. And we can only enter Christ's body (his true church) through an active faith which fears not to step out and walk as does Christ, even as Jesus used Peter there at Matthew 14 to demonstrate, making it no surprise why peter would be the one to write as he did at 1 Peter 3:21.
I will stop there for a time so you can ponder that tid-bit.
For those who wish to see the fuller picture, I will continue.
The natural question would be, 'How can that be so that we rise above the waters of wickedness in the Ark of our salvation?' You should rightly wonder, "Is it not the pure water of Christ that we rise to walk on and that holds us afloat with Christ in his body?'
Both of those questions are necessary to ask. And the answer is, 32 "And when they were come into the ship, the wind ceased.
33 Then they that were in the ship came and worshipped him, saying, Of a truth thou art the Son of God."
And when that wind ceased the waters became calm for those with Christ. That calm water represents the pure water of God's word which carries abundant authority and power in Christ and which he shares to his body.
David, speaking prophetically of Jesus shows us that it was Jesus himself that taught us this picture. Not that Jesus had sin but that he took our sins to him. Compare:
Isaiah 57:20 "But the wicked are like the troubled sea, when it cannot rest, whose waters cast up mire and dirt."
Psalms 69:1 "Save me, O God; for the waters are come in unto my soul.
2 I sink in deep mire, where there is no standing: I am come into deep waters, where the floods overflow me.
3 I am weary of my crying: my throat is dried: mine eyes fail while I wait for my God.
4 They that hate me without a cause are more than the hairs of mine head: they that would destroy me, being mine enemies wrongfully, are mighty: then I restored that which I took not away.
5 O God, thou knowest my foolishness; and my sins are not hid from thee.
6 Let not them that wait on thee, O Lord GOD of hosts, be ashamed for my sake: let not those that seek thee be confounded for my sake, O God of Israel."
I will speak more after you have time to ponder this.