This act is symbolic of Christ's death, burial and resurrection. As believers, we die to sin and are buried with Him in baptism and raised to walk with Him in newness of life. Reference: Romans 6:4
We believe in baptism by total immersion. Reference: Matthew 3:16
“Jesus answered, Verily, verily I say unto thee, except a man be born of the water and of the Spirit, he cannot enter into the kingdom of God” (John 3:5).
Water baptism is an outward demonstration that one has already had a conversion experience and has accepted Christ as his personal Saviour. Reference: Matthew 28:19, John 1:33