Now I'll agree that baptism can be the public profession of faith, as in some churches you don't go down front to get 'saved'. But is it necessary? Hmmmm, does requirement of baptism equate to works vs. faith? I think as a Southerner we sort of expect it down here but I'm not sure it's necessary. Always marked it up to a change in the heart as the defining moment
When I (Catholic) got married to my (at that time Baptist) husband, he just has to get a document from the Baptist affirming that he was baptized with water “In the Name of the Father, and of the Son, and of the Holy Spirit.”