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Salvation comes through the blood of Christ and His resurrection. There is no other name by which men can be saved (Acts 4:12). It is by grace through faith that Christ's sacrifice is counted to our account as sinners and brings us into a right relationship with God. The promise of salvation is an escape from everlasting judgment and entry into everlasting communion with God after our deaths.
If I were to be leading an individual to faith, I would want them to understand four things. First, God exists and, as God, He has the right to judge the world. While in America a large percentage of people say they believe in God, I think it is important to spend at least a little time on this to make sure that they have an accurate understanding of who and what God is. Second, sin is a failure to live according to the will of God. As judge, God will take account of all sin and judge it accordingly; sin of any form cannot be tolerated and must be punished. Furthermore, it is only by the shedding of blood that sin can be forgiven; sin yields death. Third, Jesus Christ was sent by God to be a sacrifice for the sins of the world. It would be important for them to understand that Jesus was both God and man, and that his death was a sacrifice and a punishment in place of the one sinners deserve. Fourth, it is by faith that Christ's sacrifice is counted towards our account.
Christians are justified, made right with God, at the time of conversion, but Christians should be continually striving for holiness until they are completely sanctified in the eschaton. The core of the Gospel is the ability of man to be made right with God and this atonement comes about through Christ's death and resurrection.