The definition of baptism means to place into, submerge, soak
When we are baptized, we are identifying with the death, burial and resurrection of Jesus. We are publicly acting out our faith because we are saved. When we are born again, and the old man is crucified, we are separated from the world and it’s values. Identifying with Jesus in baptism is a statement that we are no longer part of this world. (Romans 6:3-5) It is a public announcement of our faith in Jesus Christ!
New Testament water baptism is only valid after you’ve accepted Jesus as your Lord. (Acts 8:12, 37-39)
Let’s sum this up with the following analogy
A couple falls in love long before they are married. They make a commitment to spend the rest of their lives together, even before walking down the aisle and proclaiming, “I do.” Their wedding day is their proclamation to the world that they are in love and desire to live for each other forever.
This is true with water baptism. First, you fall in love with Jesus and become born again; then you “walk the aisle” of baptism. So consider water baptism as your wedding day with Jesus. You are making an outward expression of your inward decision to follow Jesus.