Here’s my attempt:
God is saving and will save his people and creation from sin and death in the Messiah Jesus, so turn away from your sin and trust in the Lord Jesus and you receive a place among his people.
The difference between mine and many of the ones listed below is that I tried to summarize the message of the Bible to people, so it directly addresses them rather than merely describing the Bible’s storyline or message. I tried to get some of the storyline in there, the gospel message, the church, and God’s primary call to all people.
How would you summarize it? Leave a comment on this post.
Dane Ortlund lists a bunch of good tries. All are worth reading. These are my favorites (my top 3 are Beale, Schreiner, and Wilson):
The OT storyline appears best to be summarized as: the historical story of God who progressively reestablishes his new creational kingdom out of chaos over a sinful people by his word and Spirit through promise, covenant, and redemption, resulting in worldwide commission to the faithful to extend that new creation rule and resulting in judgment for the unfaithful (defeat and exile), all of which issues into his glory; the NT storyline can be summarized as: Jesus’ life of covenantal obedience, trials, judgmental death for sinners, and especially resurrection by the Spirit has launched the fulfillment of the eschatological already-and-not-yet promised new creation reign, bestowed by grace through faith and resulting in worldwide commission to the faithful to extend this new creation rule and resulting in judgment for the unfaithful, unto God’s glory.
God has made promises to bring His people to Himself and He is fulfilling them all through Christ.
A holy God sends his righteous Son to die for unrighteous sinners so we can be holy and live happily with God forever.
Apprenticing with Jesus to become human again.
God glorifies himself in the redemption of sinners.
The movement in history from creation to new creation through the redemptive work of Father, Son, and Spirit who saves and changes corrupted people and places for his glory and their good.
God reigns over all things for his glory, but we will only enjoy his saving reign in the new heavens and the new earth if we repent and believe in the gospel of Jesus Christ, who is the crucified and risen Lord and who gave himself on the cross for our salvation.
Scripture tells us the story of how a Garden is transformed into a Garden City, but only after a dragon had turned that Garden into a howling wilderness, a haunt of owls and jackals, which lasted until an appointed warrior came to slay the dragon, giving up his life in the process, but with his blood effecting the transformation of the wilderness into the Garden City.
He—God in Christ—shall reign forever and ever; so today if you hear his voice, do not harden your heart but believing the good news take up your cross and follow Jesus.