You claim you understand the Bible, so are you deliberately misrepresenting Paul's gospel?
And when they (Paul and Barnabas) had preached the gospel to that city and made many disciples, they returned to Lystra, Iconium, and Antioch, strengthening the souls of the disciples, exhorting them to continue in the faith, and saying, “We must through many tribulations enter the kingdom of God.” (Acts 14:21-22 NKJV)
So when they (the Jews) had appointed him a day, many came to him at his lodging to whom he explained and solemnly testified of the kingdom of God, persuading them concerning Jesus from both the Law of Moses and the Prophets, from morning till evening. (Acts 28:23 NKJV)
Jesus also preached the gospel of the kingdom of God. (Mark 1:14-15)
You espouse a gospel about Christ, but not the gospel of Christ. Why?
The Kingdom Gospel is the good news that the King has arrived. Wherever the King is at there is the Kingdom of God. The Kingdom of God has to do with anything that is related to Christ and his ministry while he was on the earth.
The Gospel that was preached by Peter on the day of Pentecost and was later revealed to Paul, Galatians 1:11,12. is the Gospel that justifies the ungodly, Romans 4:5 and reconciles us and the world unto God, 2 Corinthians 5:18, 19. It is faith in this Gospel that saves and brings eternal life.