Romans 6:4

"Therefore we are buried with Him by baptism into death; that like as Christ was raised up from the dead by the glory of the Father, even so we also should walk in newness of life."

We practice full immersion baptism because it comes closest to the symbolism of the act.

As Christ went into the tomb, we symbolically accept His forgiveness by going under the Water to acknowledge His sacrifice.

As Christ came out of the tomb to glory, we come out of the water to the glory of the Father and to walk in our new life dedicated to Him!