Thanks for the input. However, that passage actually doesn't seem to demonstrate anything about the purpose of baptism as a public profession of faith. Rather, verse 11 clearly says that the purpose of baptism is for repentance. In fact, there are a number of other passages that demonstrate that baptism if for repentance and the forgiveness of sins.
Matthew 3:11
“I baptize you with water for repentance…”
Mark 1:4-5
“John appeared, baptizing in the wilderness and proclaiming a baptism of repentance for the forgiveness of sins. And all the country of Judea and all Jerusalem were going out to him and were being baptized by him in the river Jordan, confessing their sins.”
Mark 16:16
“Whoever believes and is baptized will be saved, but whoever does not believe will be condemned.”
Luke 3:3
“And he went into all the region around the Jordan, proclaiming a baptism of repentance for the forgiveness of sins.”
Acts 2:38
“Repent and be baptized every one of you in the name of Jesus Christ for the forgiveness of your sins, and you will receive the gift of the Holy Spirit.”
Acts 13:24
“Before his coming, John had proclaimed a baptism of repentance to all the people of Israel.”
Acts 22:16 (spoken to Paul upon his conversion to Christianity)
“Rise and be baptized and wash away your sins, calling on his name.’”
Another purpose of baptism in scripture is that we participate in Christ's death, burial, and resurrection.
Romans 6:3-4
“Do you not know that all of us who have been baptized into Christ Jesus were baptized into his death? We were buried therefore with him by baptism into death, in order that, just as Christ was raised from the dead by the glory of the Father, we too might walk in newness of life.”
There are also passages that seem to demonstrate that baptism brings us into God's covenant -- a replacement for the Old Testament circumcision.
1 Corinthians 12:12-13
“For just as the body is one and has many members, and all the members of the body, though many, are one body, so it is with Christ. 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.”
Colossians 2:11-12
“In him also you were circumcised with a circumcision made without hands, by putting off the body of the flesh, by the circumcision of Christ, having been buried with him in baptism, in which you were also raised with him through faith in the powerful working of God, who raised him from the dead.”
Acts 8:26-40 tells of the Ethiopian Eunuch's salvation. Philip proclaimed the Gospel of Jesus. The Ethopian then responded with, "See, here is water! What prevents me from being baptized?" The two of them went down into the water and the Eunuch was baptized. There were others in the party, but the focus wasn't on it being a public display.
Acts 16:25-40 talks about Paul and Silas singing hymns in jail. There was a great earthquake, the prisoners were all set free, but none escaped. As a result, the jailer was saved. The passage says that the jailer and his entire family were baptized at that very hour. Since it was at midnight, it doesn't seem like it was very public. We can make assumptions that there may have been a lot of people there, but scripture isn't clear about that.
The point is that there are scriptures that say baptism is for repentance and forgiveness, there are passages that say we are baptized into Christ, and even a verse that says baptism now saves you (1 Peter 3:18-22). However, I can not find verses that say that the purpose of baptism is to make a public profession of faith.
It seems like that idea is being read into scripture. Just like the point I was trying to make with the thief on the cross, sometimes we unfortunately read ideas into scripture and make assumptions.
Some pentecostal churches use the thief on the cross as an example to teach that their interpretation of the baptism of the Holy Spirit is not necessary for salvation. I believe we receive the Holy Spirit when we are saved (but that's another subject...start a new thread if you'd like to discuss that

). Regardless of whether or not the thief was baptized, we know he was saved because Jesus told him that he would be in paradise. However, that passage of scripture does not discuss baptism. Rather it is on the act of attonement for the forgiveness of our sins.
We might assume that the thief on the cross was never baptized at any point in his life. That probably is true and may be a safe assumption. However, we don't know because scripture does not clearly say one way or the other. Another example is the belief in the age of accountability. Many believe in it, but it is assumed and is not actually in the Bible.
Likewise, the passage of James does not deal with baptism. Actually, baptism is not mentioned once in the entire book of James. James discusses OUR works, such as feeding the hungry, taking care of the sick, clothing the naked, etc. I hope that we would agree that we are not saved by the works that we do, we are saved by God's works. Our works are an evidence of the faith that God has put in us.
Who must we prove our faith to? If God knows our hearts, then He does not need proof. Our works are an evidence of our faith to others. How would others benefit from witnessing my baptism as proof of my salvation? When I think back to my baptism and the baptisms of others, they were in a church. The witnesses were other members of the church, a body of believers. There probably were unsaved people there as well, but the church is a body of believers. Who benefited from my baptism if it were only a proof of my salvation?
Is baptism our work, or is it God's work? If baptism generates repentance, brings us into God's covenant, and provides a means of grace, then I would have to say that it is God's work. If God did a work on me in my baptism, then my baptism served a purpose in my life.
I don't mind if you disagree. A couple of years ago, I would have completely agreed with you. For the record, I was baptized twice growing up. Once as child and again in my late teens. The first time I did it because I was young and just wanted to be baptized. The second time I did it to rededicate my life to God. Now, as I've mentioned in other posts, I'm working to learn more about what the Bible teaches regarding baptism.
Sorry about the lengthy reply, but thanks for the conversation. It's forcing me think quite a bit.
