The fact is, is that I was giving you what the NT is saying the gospel is. The apostles proclaimed the euangellion/good news that Jesus is Lord. This was the gospel of the kingdom, the same kingdom that Jesus himself proclaimed. They used the same terminology as Rome, who proclaimed the good news of Caesar as Lord, Caesar’s victory over his enemies, and Rome’s securing of peace and prosperity for all her citizens.
This is what Paul’s greeting to the Romans states concerning Jesus:
Paul, a slave of Christ Jesus, called to be an apostle, and set apart for the gospel of God: the gospel he promised beforehand through his prophets in the Holy Scriptures regarding his Son, who according to the flesh was a descendent of David, and who through the Spirit was proclaimed to be the powerful, reigning Son of God by his resurrection from the dead: Jesus Christ our Lord.
This doesn’t say that Jesus will be Lord only after God’s character is vindicated after an investigative judgement beginning in 1844. It doesn’t say that Jesus will be Lord only if a final, perfect generation of sinless believers vindicates the character and claims of God. It says, Jesus is Lord! Now!
This is all over the NT. It is the good news of King Jesus and his kingdom, and there is no doubt about it. This is the good news of the kingdom and the king that the apostles proclaimed. The outcome of this proclamation was also sure, as Paul stated at the end of 1 Cor:
Then the end will come, when he hands over the kingdom to God the Father after he has destroyed all dominion, authority, and power. For he must reign until he has put all enemies under his feet, The last enemy to be destroyed is death…
Death has been swallowed up in victory…the sting of death is sin, and the power of sin is the Law, but thanks be to God who gives us the victory through our Lord Jesus Christ.
The outcome, according to Paul and the entire NT, including Revelation, is already assured. Jesus is king, Jesus already reigns, and he will consummate his kingdom of life and love and justice and peace upon his Parousia. There is no doubt about it according to the gospel proclamation. His resurrection is the assurance of the resurrection of all who believe in him. His victory over all powers, including death, is the assurance of their victory. This is the NT gospel.
We are here, in this present age, to proclaim and live as citizens of the kingdom he has inaugurated and will surely bring to full fruition. Why time has lasted this long is not answered by the NT, although Jesus does downplay the idea of timing in some of his parables. It is a difficult question that we live with by faith.
If one wants to try and explain the 2000 year wait by the investigative judgement and Adventist theology, then go ahead. Just don’t call it the biblical/NT gospel. It is not.