The Gospel

"For the wages of sin is death, but the gift of God is eternal life in Christ Jesus our Lord." Romans 6:23
God is entirely pure, ultimately holy. There is nothing bad found in Him, and there's no sin to uncover in His actions or in His character. He is exclusively good. We, on the other hand, are not. We are intrinsically disposed to sin. Since that fateful day in Eden when Adam and Eve were deceived by the serpent and tasted the forbidden fruit, directly rebelling against God Himself, we've all been cursed. We've been cursed to toil in our labors, we've been cursed with a maimed Imago Dei. We've been cursed to be contrary to one another, cursed to love sin more than our Creator. We all have heaped death upon our heads by participating in sin.
"If you confess with your mouth, 'Jesus is Lord,' and believe in your heart that God raised him from the dead, you will be saved. One believes with the heart, resulting in righteousness, and one confesses with the mouth, resulting in salvation." Romans 10:9-10
Because of our fall from Eden, because of our inclination toward sinfulness, we are born apart from God, far from salvation. But God didn't leave us to that demise. He didn't forsake us, though we had already forsaken Him. Instead, He made a way. Now we are offered the gift of eternal life in Jesus Christ. We are offered to partake in His holiness, being dressed in His righteousness. He didn't enact vengeance, but chose to enact mercy, grace, and abundant compassion through the sending of His Son. God's holiness demands recompense. Our sin demands blood to spilled; death is the payment. Rather than requiring our eternal deaths once and for all, He made a way through the Christ. Jesus would pay the penalty for our own sinfulness. Jesus would die in our place. Jesus would be brutalized on the cross and a stone would be rolled to seal Him in His grave. He wouldn't remain there, though.
"Therefore, we are ambassadors for Christ since God is making his appeal through us. We plead on Christ's behalf: 'Be reconciled to God.' He made the one who did not know sin to be sin for us, so that in him we might become the righteousness of God." 2 Corinthians 5:20-21.
Jesus, in His sinlessness, became sin for our sake. He bore the wrath of God on the cross, becoming the object of sin so that we might be spared from a fate of eternal death and separation from Him. We who know Christ are ambassadors of His grace, testifying to a lost and broken world that He is fully sufficient for the payment of sins and our eternal delight. Salvation doesn't merely require knowledge; even the demons know the work of the cross and shudder (James 2:19). Salvation demands a response on our part, a forsaking of our own desires and a yielding to God's desires. It compels us to flee from a life of sin and bear the fruit of the Holy Spirit (Galatians 5). It demands that we confess Jesus' Lordship in our lives and rely on the reality of His resurrection for our future resurrection. There's no magical rite or creed. There's no formulaic set of prayers. We are saved by grace through faith in what Jesus accomplished on our behalf. We must plead the cross of Christ to the lost, beckoning them to be reconciled to God through Christ's blood. Time is too short, and eternity is too real to spend time doing anything less.