Hi Ted,
The concept is not as cut and dry as you suggest. Please consider the following:
1. The Greek word εἰς (rendered in the translation that you posted as "for") has a large semantic range of meaning. Among the plethora of possible definitions are "for", "among", "because of", "in view of", "onto", "in", "into", etc. The word can easily be translated as "because of" since that is a proper translation of this verse that also fits the context.
2. The English word "for" also has a large range of meanings such as in order to be", "become", "get", "have", "keep", because of", "as the result of, with regard to, etc. Again, one can read the verse to where "for" means "because of" or "as the result of". The context supports this translation as well. For example, if I say that I took two tylenol tablets for my fever I am obviously not saying that I took the tables in order to get the fever but that I took the tables because of my fever.
3. In many verses of scripture, baptism is not mentioned as the cause of the remission of sins. Take Acts 10 for example where Peter is preaching to a gathering in Caesarea:
43 Of Him all the prophets bear witness that through His name everyone who believes in Him receives forgiveness of sins. 44 While Peter was still speaking these words, the Holy Spirit fell upon all those who were listening to the [
ag]message. 45 All the [
ah]circumcised believers who came with Peter were amazed, because the gift of the Holy Spirit had been poured out on the Gentiles also. 46 For they were hearing them speaking with tongues and exalting God. Then Peter answered, 47 Surely no one can refuse the water for these to be baptized who have received the Holy Spirit just as we
did, can he? 48 And he ordered them to be baptized in the name of Jesus Christ. Then they asked him to stay on for a few days.
In verse 43 Peter makes no mention of baptism as effecting remission of sins but explicitly cites faith as the vessel. This directly contradicts Acts 2:38 if baptism is the cause for the remission of sins. Secondly, the Holy Spirit fell upon them prior to their baptism which refutes that the giving of the HS only happens after baptism. Thirdly, verse 47 explains why one is baptized which involves the inability to refuse baptism once the Holy Spirit has been given. Furthermore, Peter compared the apostle's indwelling experience to the current indwelling experience calling it equal or identical.
Most Baptists hold to the reformation cry of salvation by faith alone. If baptism is necessary for the remission of sins then salvation is not by faith alone since it would also include baptism. Scripture is clear (Eph. 2) that salvation is by the grace of God through faith alone and that none of our works are included as necessary. Baptism is a work since it is a conscious work that we schedule, and do. We can boast about our baptism as I've seen many do.