The water baptism is us putting our light on a candlestick/lampstand. The candlestick/lampstand is the church. So we are showing the world that we belong to God by being baptized in the water, as a symbol of the death, burial, AND resurrection of our Lord and Saviour Jesus Christ. The water baptism is the doorway into the local church, where we can work for God, and witness to a lost and dying world. This is an ordinance, and dare say I, a sacramental occurance as well.
How is there a sacramental aspect to water baptism?