We are not under the law, we are under grace. We are given the Gospel of the grace of God now. Centered on the FINISHED WORK OF CHRIST. TOday there is ONE BAPTISM. Which has nothing to do with water. And everything to do with the work of the HOLY SPIRIT baptizing us into the Body of Christ. It's spiritual. Not physical. You can read all about it in Romans through Philemon, and starting in Acts chapter 9. Imagine that! You were just ONE CHAPTER away from knowledge of the dispensation of the grace of God.
You yourself referenced upthread the passage that there is One Baptism. So how come now you argue there is a water baptism and a spirit baptism?
Here are some other references to consider when considering that baptism is essential.
“But when the kindness and the love of God our Savior toward
man appeared, not by works of righteousness which we have done,
but according to His mercy He saved us, through the washing of
regeneration and renewing of the Holy Spirit,”
“whom He poured out on us abundantly through Jesus Christ our
Savior, that having been justified by His grace we should become
heirs according to the hope of eternal life.” - Tit 3:4-7
And how does the Spirit do this?
Then Peter said to them, “Repent, and let every one of you be
baptized in the name of Jesus Christ for the remission of sins;
and you shall receive the gift of the Holy Spirit.”
“For the promise is to you and to your children, and to all who
are afar off, as many as the Lord our God will call.” - Ac 2:38-39
More here....
http://executableoutlines.com/hs/hs_06.htm