Therefore we have been buried with Him through baptism into death, so that as Christ was raised from the dead through the glory of the Father, so we too might walk in newness of life. – Romans 6:4
Baptism is a symbol; a simple analogy for the incomprehensible exchange of a divine sacrifice for our sin and sorrow. We go under the water to wash off our old life and emerge clean and new. Jesus literally paid our debts and bought us back from slavery and death so that we could have a new life that would never end. Take the plunge and rise redeemed!