There is only one gospel in this age of God's grace and it is not the gospel of the promised Jewish kingdom on this earth.
Under God's grace the gospel is that God sent His Son to die on a cross and shed His blood to pay for the sins of the whole world. God will reject all those that do not believe He did this. According to Paul's gospel under grace a person becomes a child of God and that person's future is with God in heaven.
If a person can not see that there was A CHANGE IN THE GOSPEL after the Jews rejected their promised kingdom on this earth then they do not believe God's message of grace given to Paul.
For our conversation (citizenship) is in heaven; from whence also we look for the Saviour, the Lord Jesus Christ: Who shall change our vile body, that it may be fashioned like unto his glorious body, according to the working whereby he is able even to subdue all things unto himself. Philippians 3:20,21
For the Lord himself shall descend from heaven with a shout, with the voice of the archangel, and with the trump of God: and the dead in Christ shall rise first: Then we which are alive and remain shall be caught up together with them in the clouds, to meet the Lord in the air: and so shall we ever be with the Lord. Wherefore comfort one another with these words.
I Thessalonians 4:16-18
In the above we see that He comes for the saved under the gospel of grace. It is not the event that has Him setting His feet on the Mt. Of Olives.
Notice that our comfort is not found in the return of Christ to establish an earthly kingdom, as it was/is for Israel. Our comfort is found in Christ catching us off this earth to reign with Him for all eternity in the heavens. Our eternal destiny and conversation is in heaven, not on the earth.
Now this is what I believe and I will not argue with anyone about it. If a person does not believe what I have said here that is okay with me. But be assured that I believe it or I would not have posted it.
There was a gospel of the promised kingdom for the Jews on this earth and it has been set aside temporarily by the gospel of grace which is God's promise of a heavenly destination.
This is precisely the false gospel that Paul warned about.
Paul taught the gospel of the kingdom which is according to grace. Those who don't understand grace are open to evil suggestions.