The following website contains various articles from the Mid-Acts Perspective.
One of them, "Are There Really Two Gospels?," has yet to be disproven.
Biblical Advanced Basics - Doctrinal Topics
danoh,
1. The two gospels you speak of I would assume are law and grace and they would be doctrine.
2. If this is what you speak of one must understand the different context of the word gospel.
We all know gospel is the good news and the gospel of the kingdom was preached by John the Baptist and Jesus and the Gospel of the Grace of God by Paul.
The overall gospel of redemption is one if one says salvation of sins forgiven, saved by grace. It was always unmerited favor to save sinners. What makes them appear differently is the revelation revealed to them.
3. Gradual revelation went from conscience and making a sacrifice in the antediluvian period. Then there were the Patriarchs; Abraham, Isaac, and Jacob where God made the jewish nation began and to whom the promises were made and the covenants. Abrahams covenant was families of the earth being blessed and grace without works. Then the law came by God through Moses and came because of transgressions and was for a time till the seed of the Messiah should come. So now there was a written law. Redemption was allocated by their conscience and then the written law and then the crucified one at Calvary who was the reality of the types and the fullness of grace in the redemption plan of God.
4. Mark says the beginning of the gospel of Jesus Christ, the Son of God which would be more specific to his role as Messiah to the jews who were to believe in Jesus to be born again.
5. The overall gospel of redemption is all related but unfolded in many contexts of gradual revelation throughout history and was allocated differently. In this context there is only one gospel which always had the sacrifice for sins to be for the whole world though limited in Adam and Eve's day and the types and shadows in the old covenant and even in the transition of Christ the reality. Now we have Jesus Christ who is the fulness of grace and truth by way of Calvary and the new covenant.
6. The difference of the context of the 2 gospels of the old and new covenants.
7. The gospel of the kingdom was a part of the old covenant given to Moses and Israel. The Kingdom of Heaven was the earthly kingdom reign (Matthew 4:17) and the Kingdom of God was the spiritual aspect (Matthew 6:33; Luke 17:20). This dealt with Israel's promises and callings of the physical kingdom reign on earth and the land. This is why Matthew 1 gives the geneologies of Abraham and David. Abraham was the land and families of the earth being blessed through Israel and David which God promised would always have a throne in his lineage and it was unconditional as far as coming to pass, but it was conditioned by obedience which will eventually happen.
8. The reason for the KoH and the KoG to be established is the restitution of all things and this is the kingdom that Peter was looking for and Christ said it is not for you to know the times and seasons. When the Day of Pentecost came to pass he recognized signs of the kingdom like the pouring of the Holy Spirit even though he knew it was not a fulfillment of Joel's prophecy. Peter still mentions the restitution of all things because he understood the signs.
9. The KoH and the KoG started in the garden of Eden. Adam and Eve ruled the garden and over all creation and they believe in God. When they sinned they lost the spiritual KoG and the physical kingdom which was represented by the garden for they were kicked out. God will not rule with man unless he has a holy heart.
Step up to Jesus day; the Mosaic law was in effect and Jesus taught it and preached the gospel of the kingdom which was only for jews (Matthew 10:6-7). This was never a message for the gentiles because the gentiles never had a covenant and were not under the law of Moses and the church has a heavenly calling though it has to do with reigning on the earth as well in the earthly kingdom. Israel will be at the head of the nations (Isaiah 2:2-4). Nonetheless, Jesus made the offer and the jews rejected him. It was always prophesied they would reject him and the jews missed him because they were focused on the physical kingdom and freedom from their oppressors of Rome and did not repent. Their rejection is found in (Matthew 23:37-39).
10. The kingdom message today is the kingdom of his dear son which is spiritual and not the KoH Jesus preached. Jesus never taught the death, burial, and resurrection to the jews under the KoH and the KoG message. He was teaching the Mosaic law and the only requirement for jews to be born again was to believe in Jesus and his forgiveness of sins in order to gain entrance into the earthly kingdom reign.
It was not until after the jewish nation rejected him that he started mentioning about the death and resurrection. And the last 40 days he still had to expound to his disciple what had transpired for they didn't fully understand it (Luke 24:44-49) Acts 1:3 he was telling about the kingdom of God and what their mission was.
11. If we suffer we shall reign; so we are being trained for ruler ship positions now in the earthly kingdom. We will be rapture before the tribulation the program for purging of the jews will begin. The last 3 and 1/2 years of the tribulation known as Jacob's trouble the gospel of the Kingdom will be preached to all nations (Matthew 24:14).
12. So the gospel of the Kingdom of Heaven is not the Gospel of the grace of God because it is about the physical rule of the earthly calling of Israel as head of the nations. This is different than the churches calling.
The Kingdom of God in Jesus day is slightly different than the gospel of the grace of God because their revelation was to believe in the Messiah to forgive them of their sins and bring them back into covenant. Even though the law could not save them, they were required to live the law as well.
13. The Kingdom of God today is mainly spiritual and the revelation is Christ finished work.
Paul said there is only one gospel for today and that is the death, burial, and resurrection (1 Corinthians 15:1-4).
14. The overall redemption gospel is the same concerning the need of a sacrifice and it was given through different revelations upon different rules of how to attain to it.
The jews were under the Mosaic law and it was about doing looking towards the cross and we are looking back at the cross of what he did. We need to get out of doing and get into being according to the finished work of Christ. Jerry Kelso