Many seem to deny that the message of the gospel preached by Jesus during His ministry is something very different from the message of the gospel preached by Paul.
Following are excerpts from an article that speak to this issue:
Although we now know that the redemptive work of Christ’s death and resurrection is the crux of our message of salvation for today, we must be careful not to read into Jesus’ ministry what is not there.
We would search in vain for a clear presentation of the preaching of the cross in the ministry of Jesus and the disciples in Matthew, Mark, Luke, or John...
Jesus did not preach his redemptive work on the cross for salvation during his ministry on earth. Instead, Jesus taught the gospel of the coming kingdom (Mark 1:14-15).
This gospel consisted of repentance from sin, doing the commandments, and seeking first the kingdom (Matt 5:19, 6:33). Although these ideas are commonly recognized as good and Biblical ideas, none of them include faith in the redemptive work of Christ on the cross.
It was the specific message of the gospel of the kingdom that Jesus limited his ministry...
It may be supposed that although Jesus talked a lot about the kingdom, that he still taught faith in his death on the cross for justification unto life. However, again, the Scriptures show us otherwise...
Jesus came to a specific people, to preach a specific message, and to die a specific death. What can not be found in his exclusive ministry is salvation from the preaching of the cross...
The following excerpts from an interview explaining at a higher level what is going on with Evangelicals:
Evangelicals have grown up with a gospel, and that gospel has become their hermeneutic, and that hermeneutic is essentially derived from a specific way of reading Paul, and by that I mean a soteriological reading of Romans 1-8. It is the way we (or most of us) think.
The minute a kingdom hermeneutic comes up, one either abandons the Pauline hermeneutic or one synthesizes or — and I think this is most common — one colonizes Jesus’ kingdom hermeneutic by a justification hermeneutic. That is, we make Jesus talk Paul. Or, we colonize Paul with Jesus’ kingdom hermeneutic and make Paul talk Jesus.
Evangelicals are worried that if we colonize Paul with Jesus’ kingdom hermeneutic we will lose a Pauline soteriology. There are plenty of cases where that very thing happened. But I think many are doing the very same thing by colonizing Jesus with Paul.
Note that both parties embrace the gospel of Paul. While I don't agree with doing this, I applaud their intellectual honesty in acknowledging that message of the gospel preached by Jesus during His ministry is something very different from the message of the gospel preached by Paul. Something that seems to be lacking in those who deny this.
As for me, I stand solely on the gospel preached by Jesus during His ministry. By and large, I find the words attributed to Jesus while He walked the Earth to be reasonably sound and reasonably coherent within themselves. What's more, I find much of what was attributed to Him to be remarkably deep and quite profound. As such, by and large, I find the words attributed to Jesus while He walked the Earth to be "true". I don't share that view of the mythology and beliefs that the NT writers wrapped around them. At best, they can merely echo His words. At worst, they deviate from His words and at times substantially so.