As Christians, we are commanded to be baptized as a response to our faith in Christ. “Go therefore and make disciples of all the nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit” (Matthew 28:19). And He [Jesus] said to them, “ ‘Go into all the world and preach the Gospel to every creature. He who believes and is baptized will be saved; but he who does not believe will be condemned’’ ” (Mark 16:15, 16).
The word baptize literally means “to dip or immerse.” The act of going under water during baptism, symbolizes being buried in death. It is a symbol of our dying to our old life and resurrecting in our new life (Romans 6:1-4). It demonstrates an outward sign of an inward change. We see baptism as a public testimony of our faith in Christ. Some say that water baptism is necessary for salvation: that's not really true. In Scripture we only see those who were already believers being baptized. It's important to remember that salvation is based upon what Christ has done, not on what we can earn (Ephesians 2:8-9). Since it is only for believers who profess faith in Christ, it would exclude infants since they can’t make their own profession.