A Textual Commentary on the Greek New Testament, pp. 122-128, and William Hendriksen, The Gospel of Mark, pp. I also do not believe water baptism is in view in Romans 6 or Galatians 3. For a detailed exposition of those passages, I refer you to my commentaries on Galatians and Romans, or the tapes of my sermons on Galatians 3 and Romans 6. Paul's sins were washed away not by baptism, but by calling on His name.
Baptism is certainly important, and required of every believer.
However, the New Testament does not teach that baptism is necessary for salvation.