Paul NEVER wrote in any epistle that water baptism was a requirement for salvation.
Paul's epistles were written to believers who had already submitted to water baptism, and had been given the Holy Ghost as well. The letters included detailed explanation of aspects of their rebirth experience. Of which one was water baptism.
Paul instructs the born again Corinthians concerning the relevance of their water baptism in the name of Jesus.
Is Christ divided? was Paul crucified for you? or were ye baptized in the name of Paul? 1 Cor 1:13
I thank God that I baptized none of you, but Crispus and Gaius;
Lest any should say that I had baptized in mine own name.
And I baptized also the household of Stephanas: besides, I know not whether I baptized any other. 1 Cor 1:14-16
Members of the church of Corinth that Paul water baptized:
And Crispus, the chief ruler of the synagogue, believed on the Lord with all his house; and many of the Corinthians hearing believed, and were baptized. Acts 18:5
The elder unto the wellbeloved Gaius, whom I love in the truth.
Beloved, I wish above all things that thou mayest prosper and be in health, even as thy soul prospereth.
For I rejoiced greatly, when the brethren came and testified of the truth that is in thee, even as thou walkest in the truth. 3 John 1-3
I beseech you, brethren, (ye know the house of Stephanas, that it is the firstfruits of Achaia, and that they have addicted (devoted) themselves to the ministry of the saints,)1 Cor 16:15
Paul’s Epistles - Spirit and water baptism
(Rom 6:3-5, 1 Cor 1:15-16, 1 Cor 12:13, Gal 3:27, Col 2:12)
Rom 6:3-5 “Know ye not, that so many of us as were baptized into Jesus Christ were baptized into his death? 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.
FOR IF we have been planted together in the likeness of his death, we shall be also in the likeness of his resurrection:” THIS IS WATER BAPTISM. HOLY GHOST BAPTISM IS DONE BY GOD, AND IS NOT DONE INTO JESUS CHRIST.
1 Cor 1:15-16 “Lest any should say that I had baptized in mine own name. And I baptized also the household of Stephanas: besides, I know not whether I baptized any other.” ALL WATER BAPTISMS WERE ADMINISTERED USING A NAME. (JESUS)
1 Cor 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.” BOTH WATER BAPTISM AND RECEIVING THE SPIRIT
Gal 3:2 “This only would I learn of you, Received ye the Spirit by the works of the law, or by the hearing of faith?” RECEIVING THE SPIRIT IS PART OF THE GOSPEL MESSAGE.
Gal 3:27 “For as many of you as have been baptized into Christ have put on Christ.” Same as stated in Romans 6.
Col 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.” Same as stated in Romans 6.