So we both agree that the Apostles taught/preached what Jesus taught them to teach/preach, correct? And you claim Jesus told them to teach/preach the "Good News of the Kingdom", correct?
This is what I believe the "Good News" to be:
Acts 5:41-42 (ESVST) 41 Then they left the presence of the council, rejoicing that they were counted worthy to suffer dishonor for the name. 42 And every day, in the temple and from house to house, they did not cease teaching and preaching that the Christ is Jesus.
Acts 10:34-43 I won't take up space with these verses, you can read them in your Bible.
Act 11:19-21 (ESVST) 20 But there were some of them, men of Cyprus and Cyrene, who on coming to Antioch spoke to the Hellenists also, preaching the Lord Jesus. 21 And the hand of the Lord was with them, and a great number who believed turned to the Lord.
Romans 1:16-17 (ESVST) 16 For I am not ashamed of the gospel, for it is the power of God for salvation to everyone who believes, to the Jew first and also to the Greek. 17 For in it the righteousness of God is revealed from faith for faith, as it is written, "The righteous shall live by faith." (What is the power of God for salvation?)
Romans 15:19-21 (ESVST) — so that from Jerusalem and all the way around to Illyricum I have fulfilled the ministry of the gospel of Christ; 20 and thus I make it my ambition to preach the gospel, not where Christ has already been named, lest I build on someone else's foundation, 21 but as it is written, " Those who have never been told of him will see, and those who have never heard will understand." (If the gospel is about the paradise earth or using God’s personal name, why would it matter who preached where?)
1Co 1:17 (ESVST) 17 For Christ did not send me to baptize but to preach the gospel, and not with words of eloquent wisdom, lest the cross of Christ be emptied of its power.
1Co 1:21-24 (ESVST) 22 For Jews demand signs and Greeks seek wisdom, 32 but we preach Christ crucified, a stumbling block to Jews and folly to Gentiles, 24 but to those who are called, both Jews and Greeks, Christ the power of God and the wisdom of God.
1Co 2:1-2 (ESVST) 1 And I, when I came to you, brothers, did not come proclaiming to you the testimony of God with lofty speech or wisdom. 2 For I decided to know nothing among you except Jesus Christ and him crucified.
1Co 15:3-5 (ESVST) 3 For I delivered to you as of first importance what I also received: that Christ died for our sins in accordance with the Scriptures, 4 that he was buried, that he was raised on the third day in accordance with the Scriptures, 5 and that he appeared to Cephas, then to the twelve.
2Co 4:2-4 (ESVST) 3 and even if our gospel is veiled, it is veiled to those who are perishing. 4 In their case the god of this world has blinded the minds of the unbelievers, to keep them from seeing the light of the gospel of the glory of Christ, who is the image of God.
Eph 3:5-7 (ESVST) 6 This mystery is that the Gentiles are fellow heirs, members of the same body, and partakers of the promise in Christ Jesus through the gospel.7 Of this gospel I was made a minister according to the gift of God 's grace, which was given me by the working of his power.
Philippians 1:15-18 (ESVST) 15 Some indeed preach Christ from envy and rivalry, but others from good will. 16 The latter do it out of love, knowing that I am put here for the defense of the gospel. 17 The former proclaim Christ out of selfish ambition, not sincerely but thinking to afflict me in my imprisonment. 18 What then? Only that in every way, whether in pretense or in truth, Christ is proclaimed, and in that I rejoice.
Col 1:21-23 (ESVST) 21 And you, who once were alienated and hostile in mind, doing evil deeds, 22 he has now reconciled in his body of flesh by his death, in order to present you holy and blameless and above reproach before him, 23 if indeed you continue in the faith, stable and steadfast, not shifting from the hope of the gospel that you heard, which has been proclaimed in all creation under heaven, and of which I, Paul, became a minister.
2Ti 1:8-12 (ESVST) 8 Therefore do not be ashamed of the testimony about our Lord, nor of me his prisoner, but share in suffering for the gospel by the power of God, 9 who saved us and called us to a holy calling, not because of our works but because of his own purpose and grace, which he gave us in Christ Jesus before the ages began, 10 and which now has been manifested through the appearing of our Savior Christ Jesus, who abolished death and brought life and immortality to light through the gospel, 11 for which I was appointed a preacher and apostle and teacher, 12 which is why I suffer as I do.
2Ti 2:8-10 (ESVST) 8 Remember Jesus Christ, risen from the dead, the offspring of David, as preached in my gospel, 9 for which I am suffering, bound with chains as a criminal. But the word of God is not bound! 10 Therefore I endure everything for the sake of the elect that they also may obtain the salvation that is in Christ Jesus with eternal glory.
These verses are my take on what the "GOOD NEWS" of the Kingdom is, because it is what the disciple taught and preached.