The sermon addresses the debated question of whether baptism is a prerequisite for salvation, focusing on Acts 2:38. It argues that while baptism is a significant act of obedience following faith, it is not the means by which forgiveness is obtained, emphasizing that salvation is a gift of grace received through faith in Jesus Christ. The speaker clarifies that the Greek word 'for' in the passage allows for multiple interpretations, but ultimately supports the understanding that baptism is a consequence of, rather than a condition for, receiving forgiveness and the Holy Spirit, reinforcing the biblical principle that salvation is not earned through works but freely given through faith.