Sorry, but the Bible shows only believers (meaning those already saved) were baptized with the triune formula as commanded in by Jesus.
1. Get sacved
2. Get baptized
3. Learn the Word!
4. Live the Word
That is how it works. Water Baptism is simply a public declaration of something that has already taken place inside! Being immersed (not sprinkled) has no saving power. It is faith that saves and not water baptism.
sound like a public demonstration to you?
Or symbolic?
Acts 22:16
And now why tarriest thou? arise, and be baptized, and wash away thy sins, calling on the name of the Lord.
Rom 3:24
Being justified freely by his grace through the redemption that is in Christ Jesus:
Romans 6:3
Know ye not, that so many of us as were baptized into Jesus Christ were baptized into his death?
Rom 6:4
Therefore we are buried with him by baptism into death: that like as Christ was raised up from the dead by the glory of the Father, even so we also should walk in newness of life.
Acts 2:47
Praising God, and having favour with all the people. And the Lord added to the church daily such as should be saved.
1 Corinthians 12:13
For by one Spirit are we all baptized into one body, whether we be Jews or Gentiles, whether we be bond or free; and have been all made to drink into one Spirit.
Galatians 3:27
For as many of you as have been baptized into Christ have put on Christ.
Ephesians 4:5 One Lord, one faith, one baptism, Colossians 2:12 Buried with him in baptism, wherein also ye are risen with him through the faith of the operation of God, who hath raised him from the dead.
2 Corinthians 5:17
Therefore if any man be in Christ, he is a new creature: old things are passed away; behold, all things are become new.
Heb 10:22
Let us draw near with a true heart in full assurance of faith, having our hearts sprinkled from an evil conscience, and our bodies washed with pure water.
(Born of God) faith and baptism
Jn 1:12-13 But as many as received him, to them gave he power to become the sons of God, even to them that believe on his name:
13 Which were born, not of blood, nor of the will of the flesh, nor of the will of man, but of God.
1 Jn 5:4 For whatsoever is born of God overcometh the world: and this is the victory that overcometh the world, even our faith.
5 Who is he that overcometh the world, but he that believeth that Jesus is the Son of God?
6 This is he that came by water and blood, even Jesus Christ; not by water only, but by water and blood. And it is the Spirit that beareth witness, because the Spirit is truth.
7 For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one.
8 And there are three that bear witness in earth, the Spirit, and the water, and the blood: and these three agree in one.
1 pet 1:2 Elect according to the foreknowledge of God the Father, through sanctification of the Spirit, unto obedience and sprinkling of the blood of Jesus Christ: Grace unto you, and peace, be multiplied.
1 Peter 1:22
Seeing ye have purified your souls in obeying the truth through the Spirit unto unfeigned love of the brethren, see that ye love one another with a pure heart fervently: see Ez 36
Rev 1:5 And from Jesus Christ, who is the faithful witness, and the first begotten of the dead, and the prince of the kings of the earth. Unto him that loved us, and washed us from our sins in his own blood, (baptism rom 6:3-4)
1 Pet 3:20
Which sometime were disobedient, when once the longsuffering of God waited in the days of Noah, while the ark was a preparing, wherein few, that is, eight souls were saved by water.
21 The like figure whereunto even baptism doth also now save us!
(Ark of Noah a type of the church, member of Christ and his church and salvation by baptism!)
(Outside the ark all died and outside the church there is no salvation!)