Why is water baptism important?
Christian baptism is, according to the Bible, an outward testimony of what has occurred inwardly in a believer's life. Christian baptism illustrates a believer's identification with Christ's death, burial, and resurrection.
Can any man forbid water, that these should not be baptized, which have received the Holy Ghost as well as we? And he commanded them to be baptized in the name of the Lord. Then prayed they him to tarry certain days.
- Acts 10:47-48 (KJV)