A short five point explanation of the Christian Gospel

GOD (Rules) God really exists! He made the world, and that includes you and me. We believe this because he has clearly revealed himself in the historic person of Jesus Christ whom he raised from the dead. Jesus is the rightful ruler of the world.
See Gen 1:1; Mt 28:18; Phil 2:9-11.

MAN (Rebel) None of us has lived consistently as though this was the state of affairs. We have all by degree assumed that we have the right to run our own lives. Sometimes we have consciously disobeyed God; at other times we have just ignored him. It amounts to the same thing, rebellion.
See Mk 7:21-23; Rom 3:12; 1 Jn 3:4.

GOD (Repent) In Christ, God tells us that this is not our world to live in according to our selfish desires. It is God's world. Therefore we should stop rebelling against him and live in the world the way he has designed us to live in it. He calls us to come into his 'Kingdom', that is to submit to his kingly rule in our lives.
See Mt 7:21; Mk 1:14,15; Acts 17:30.

WHAT IF I DON'T? (Unforgiven) If we refuse God's offer of forgiveness and reconciliation, we will remain unforgiven and unreconciled. Ultimately, rebels will be overthrown.
See Mt 7:23,26,27; Rom 1:18; 2 Thess 1:8,9.

WHAT IF I DO? (Forgiven) If we stop rebelling and bring our lives under God's rule, he treats us as though we had never rebelled against him. He accepts us wholeheartedly because Jesus in dying on the cross took upon himself the punishment we deserve. A whole new relationship with God then opens up. We become his friends and are adopted into his family and will live with him for all eternity after death in the glorious new world that is coming.
See Jn 3:16; Rom 6:23, 8:1,15; Col 2:14.