Scripture begins by telling us that God created the world. He made everything good and perfect. He created men and women in his image, and they were designed to obey him and live in fellowship with him.
The first humans (Adam & Eve) disobeyed God, ruining the perfect fellowship they had with God. Since God is holy, he cannot tolerate unholiness. Because he is a good and just God, he must punish evil and disobedience. Thus, men and women were forever estranged from God, doomed to die because of their sin.
Instead of killing Adam and Eve on the spot, God showed them kindness they didn't deserve by letting them live. That undeserved kindness is called grace. God continued to show grace to his people in various ways through the Old Testament, and all of those glimpses of grace pointed to the ultimate expression of grace that would provide our redemption. Jesus is the Redeemer, who saves people from their sin even when they do not deserve to be saved. He willingly takes the punishment sinful men and women deserve for their sins, so that we are forgiven. And Jesus gives us his perfect obedience (his righteousness) as a gift to be received by faith. We trust that Jesus makes us right with God.
Jesus began the renewal process when he was on earth nearly two thousand years ago. He began to break the curse of sin that resulted from the Fall. But Jesus will return again to make all things new, perfectly judging the world in righteousness. We trust in Jesus as we wait for that day, and we share the good news about Jesus Christ as we wait. We trust that God truly knows what is best for us, and we obey him according to Scripture so that we can see glimpses of this restoration in the here and now.