Grace is a charisma a gift of God that works in us and even though us. "I became a servant of this gospel by the gift of God's grace" (Eph3:7) We need to be cleansed by water and refined by fire. The literal baptism may not be any more necessary than the animal sacrifices were. But this still represents a work that God needs to do in our life. Even the living water that flows from the Temple of God in Heaven today. This is represented by the Hebrew letter mem. In English the letters M & W represents water that can cleanse us or devour us. As fire can cleanse and refine or destroy. Healing is in the water, in the river of life. The tree of life is planted beside this river and the water flows into the Crystal sea where the sand looks like crystal and even diamonds.Now, we are under the Gospel of Grace, water baptism is no longer required.
"Then the angel showed me a river of the water of life, as clear as crystal, flowing from the throne of God and of the Lamb down the middle of the main street of the city. On either side of the river stood a tree of life, producing twelve kinds of fruit and yielding a fresh crop for each month. And the leaves of the tree are for the healing of the nations. " (Rev 22:2)