First, one must believe that Jesus is the Son of God. John 8:24, Jesus said, “Unless you believe that I am He, you will die in your sins.” This belief is verified in the conversion of the Ethiopian Eunuch when he said, “‘Here is water, what doth hinder me to be baptized?’ And Philip said, ‘If you believe with all your heart you may.’ And he answered and said, ‘I believe that Jesus Christ is the Son of God.'” (Acts 8:36-37)
The need for confession is something that Jesus Himself emphasized in His teachings (cf. Matt. 10:32-33). This isn’t merely uttering the words: “I believe that Jesus is God” but it’s more of a testimony to the commitment that we are making to live for Jesus and to stand up for Him before all men (cf. Rom. 10:9-10).
The scriptures teach that repentance must be enacted by the individual who desires to be saved (cf. Acts 2:38). The term repentance refers to the act of turning away from sin and living a life that if different than our former worldly selves (cf. Matt. 3:8; Eph. 4:17-24).
The Bible also teaches that baptism is essential to salvation because it connects us to the blood of Christ (cf. Rom. 6:3-7). Baptism, in the Bible, means being immersed in water (cf. Acts 8:36-39). Without baptism, one cannot be saved from their sins (cf. Acts 2:38; 1 Pet. 3:21).
The Bible teaches that one can be lost after they have been saved if they don’t remain committed to Christ by living faithfully (cf. 2 Pet. 2:20-22). Living faithfully includes being a part of a local church, being holy as God is holy and making sacrifices in order to help one another and get to Heaven (cf. Eph. 4:24-6:18; Rev. 2:10).