God sent in a rescuer and we need rescuing. God laid the groundwork in the Old Testament. He prepared the entire world to understand how His great rescue is possible and how it will work.
The entire Old Testament is God calling humanity back to Himself, helping us remember who He is and who we are supposed to be, and giving us the ability to choose life instead of death - to choose wholeness, instead of brokenness. It all leads to the moment we find in Matthew, Mark, Luke, John, and Acts - the climax of the story, the coming of our Rescuer - Jesus.
And Jesus reveals to us the whole plan. Tells it to us straight.