The word baptism means to "immerse." Since baptism is burial, it stands to reason you must be "put under!" The purpose of baptism is to remit, or wash away, your sins. Where does the power lie in baptism to wash away every sin you have committed? It is not in the preacher: it is not in the water! Something must be said over you that has all the power. The name of the Lord Jesus Christ is the only name with all the power! (Matthew 28:18). This is the only way the apostles baptized: in the name of Jesus (Acts 2:38, Acts8:6, Acts 10:47-48). Even if you have been baptized another way, you need to be baptized again in the name of Jesus (Acts 19:5).