Are you unaware that we who were baptized into Christ Jesus were baptized into his death?
The origin and foundation of Christian Baptism is Jesus. Before starting his public ministry, Jesus submitted himself to the baptism given by John the Baptist. The waters did not purify him; he cleansed the waters...Jesus' immersion in the water is a sign for all human beings of the need to die to themselves to do God's will. Jesus did not need to be baptized...however, he wanted to show his solidarity with human beings in order to reconcile them to the Father. By commanding his disciples to baptize all nations, he established the means by which people would die to sin -- Original and actual -- and begin to live a new life with God. --United States Catholic Catechism for Adults, pps. 183 - 18