Although the first people God created, Adam and Eve, had complete freedom to live in friendship and trust with Him, they chose to rebel (Gen. 3:1-7). Because God designed that Adam would represent the entire human race, his sin was catastrophic not only for him but for us: “one trespass led to condemnation for all men” (Rom. 5:18). Our fellowship with God was broken. Instead of enjoying His holy pleasure, we instead face His righteous wrath. Through this sin, we all died spiritually (see Rom. 3:1-20; Eph. 2:1-10) and the entire world was affected. God also cursed the world over which humanity had been set to reign as His lieutenants (see Gen. 3 :17-19). “The creation was subjected to futility, not willingly, but because of Him who subjected it” (Rom. 8:20). And we all individually sin against God in our own lives: “for all have sinned and fall short of the glory of God” (Rom. 3:23).
God would have been perfectly just to leave matters there, with all human beings under His holy judgment, but He didn’t. God instead set in motion His plan to save His people from sin and judgment and set free the entire creation from its subjugation to sin and the curse. How? By sending His Son as a true man who would bear the penalty for our sin and die in our place: “Christ died for our sins in accordance with the Scriptures” (1 Cor. 15:3).
The best-known verse in the Bible summarizes the required response to this good news: “For God so loved the world, that He gave His only Son, that whoever believes in Him should not perish but have eternal life” (John 3:16).
To “believe in” Jesus includes both a wholehearted trust in Him for forgiveness of sins and a decision to forsake one’s sin or to “repent”: All who truly “repent [or turn from their sins] and believe [in Jesus for the forgiveness of their sins]” will be redeemed (Mark 1:15) and restored to a right relationship with God. To “believe in” Jesus also requires relating to, and putting trust in, Jesus as He truly is—not just a man in ancient history but also a living Savior today who knows our hearts and hears our prayers.