The gospel is the good news that Christ lived a perfect life and died on the cross to satisfy God’s wrathful punishment for our sins. He then rose from the dead on Easter to prove his divinity. Because of Jesus’ payment in full for our debt, it is now possible for anyone to receive salvation and entrance into heaven through a living faith in Jesus Christ …That is only a fraction of the Gospel.
And after that John was delivered up, Jesus came into Galilee, preaching the gospel of the kingdom of God, / And saying: The time is accomplished, and the kingdom of God is at hand: repent, and believe the gospel.Errors of omission will always trip people up.
— Mark 1:14-15
The gospel of the kingdom is in the post.