To be a follower of Jesus is to believe in the Gospel of Jesus Christ. The gospel is the good news of redemption that comes from the sacrifice of Jesus on behalf of sinful humanity. Humanity, tainted by the sin of the first man Adam and our own individual sins, does not function as God intended when he brought about his creation. Humanity and creation as a whole, is still reeling from the disobedience of Adam. The only way to mend the broken relationship between humanity and God is for God to give up himself and pay what is required.
Jesus, the son of God, became human, lived an obedient life, was sentenced to death for a crime he did not commit but rose from the grave on the third day to restore that which was broken and provide hope and light for the hopeless and those living in darkness.
To experience the salvation that Jesus offers merely requires faith in Jesus and the recognition for redemption. Simply put, to experience salvation is to believe the Gospel of Jesus.