How do we know that total immersion in baptism is necessary?

Total immersion in baptism is essential because it symbolizes the totality of being submerged into Christ and His judgment. Just as Shadrach, Meshach, and Abednego were thrown entirely into the fiery furnace, baptism represents being fully plunged into the death of Christ. In this act, believers are publicly acknowledging that they have been judged in Christ and set free from sin. The physical act of immersion not only depicts the seriousness of sin’s judgment but also the complete rescue and deliverance provided through Christ, which is central to the Gospel message.