Some argue that Galatians 3:27
For as many of you as were baptized into Christ have put on Christ.
The argument is that Galatians 3:27
The question, "Is baptism necessary for salvation?", is misleading. We believe that baptism is "necessary" for salvation in that baptism is commanded by God, and thus one who refuses baptism demonstrates a lack of true saving faith. A better question to use for framing this debate is, "At what point is a person saved: upon having faith, or upon being baptized?"
The key issue is not these individual passages, but rather, answering the question, "Does the Bible teach that salvation is through faith alone?" If the answer to that question is "Yes," then the question is, "What exactly does it mean to be saved through faith alone?"
The value in debating these individual passages is simply to demonstrate that they do not contradict the doctrine of salvation through faith alone. However, we do not build our theology of salvation upon these individual passages. They are peripheral to the key issue, which is the doctrine of salvation through faith alone.
In Galatians 2:16
...yet we know that a person is not justified by works of the law but through faith in Jesus Christ, so we also have believed in Christ Jesus, in order to be justified by faith in Christ and not by works of the law, because by works of the law no one will be justified.
So, what Paul is saying in Galatians 3:27
There is nothing in the context of Galatians 3:27
For in one Spirit we were all baptized into one body—Jews or Greeks, slaves or free—and all were made to drink of one Spirit.
Furthermore, we know that baptism by the Holy Spirit is a thing because John says this in John 1:33
I myself did not know him, but he who sent me to baptize with water said to me, "He on whom you see the Spirit descend and remain, this is he who baptizes with the Holy Spirit."
There is no good reason to believe that Galatians 3:27