Salvation consists of deliverance from all sin and unrighteousness through the blood of Jesus Christ. The New Testament experience of salvation consists of repentance from sin, water baptism in the name of the Lord Jesus Christ for the remission of sins, and the baptism of the Holy Ghost, after which the Christian is to live a godly life (Acts 2:36-41).
Water baptism is an essential part of New Testament salvation and not merely a symbolic ritual. It is part of entering into the kingdom of God (God's church, the bride of Christ), and therefore, it is not merely a part of local church membership. (See John 3:5; Galatians 3:27).
Water baptism is to be administered only by immersion. Paul said, "We are buried with him [Jesus Christ] by baptism (Romans 6:4; see Colossians 2:12), Jesus came up "out of the water" (Mark 1:10), and Philip and the eunuch went down "into the water" and came up "out of the water" (Acts 8:38-39). Jesus' death, burial, and resurrection are applied to our lives when we experience New Testament salvation: "Repent [death to sin], and be baptized [burial] every one of you in the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost [resurrection]." (See Acts 2:38; Romans 6:1-7; 8:2).
The name in which baptism is administered is vitally important, and this name is Jesus. Jesus' last command to His disciples was, "Go ye therefore, and teach all nations, baptizing them in the name of the Father and of the Son, and of the Holy Ghost" (Matthew 28:19). We should notice that He said name (singular) not names. As previously explained, Father, Son, and Holy Ghost are not names of separate persons, but titles of positions held by God. An angelic announcement revealed God's saving name in the New Testament: "She shall bring forth a son, and thou shalt call his name JESUS: for he shall save his people from their sins" (Matthew 1:21). The apostles understood that Jesus was the name to use at baptism, and from the day that the church of God was established (the Day of Pentecost) until the end of their ministry, they baptized all nations (Jews--Acts 8:16; Gentiles--Acts 19:5) in the name of the Lord Jesus Christ. In fact, Jesus is the only name given for our salvation. "Neither is there salvation in any other: for there is none other name under heaven given among men, whereby we must be saved" (Acts 4:12).
The baptism of the Holy Ghost is the birth of the Spirit (John 3:5). This spiritual baptism is necessary to put someone into the kingdom of God (God's church, the bride of Christ) and is evidenced by speaking in other tongues (other languages) as the Spirit of God give utterance. It was prophesied by Joel (Joel 2:28-29) and Isaiah (Isaiah 28:11), foretold by John the Baptist (Matthew 3:11), purchased by the blood of Jesus, and promised by Him to His disciples (John 14:26; 15:16). The Holy Ghost was first poured out on the Day of Pentecost upon the Jews (Acts 2:1-4), then upon the Samaritans (Acts 8:17), and later upon the Gentiles (Acts 10:44-46; 19:6). "The promise is unto you, and to your children, and to all that are afar off, even as many as the Lord our God shall call" (Acts 2:39).