So smvoice’s (I think that’s who it was, if I’ve got it wrong WOW am I sorry) assertion that Peter’s Gospel was different than Paul’s Gospel is... what, something you agree with or disagree with?
I haven't given a whole lot of study, but my first thoughts are that Peter did preach of the Kingdom and his main congregation was composed of the Jewish Christians. Their understanding of the gospel was how God related to the Jewish nation by sending the Messiah who would establish his kingdom on earth for an everlasting heritage to them. The various laws and practices and rituals were geared towards that nation - the people of promise. Peter's mission to them was to bring them to an understanding of who Jesus actually was and to prepare them to follow God through Christ in obedience, worship and honor.
Paul was called to be the apostle to the gentiles. His Gospel of Jesus Christ's death, burial and resurrection for our sins being offered as a gift of grace received by faith was a new message because the promises had always been to the Jews. Through Paul, a Jew, God opened wide the gates to salvation for all who would come to Christ. He also proclaimed the unheard of doctrine that the gentile would be grafted into the vine and would be adopted as sons into the family of God through faith in the grace God had so freeing given.
This may or may not be the exact assertion smvoice is speaking of, but I think I understand it and actually have very little that I would disagree with.
I don't believe Peter and the others were proclaiming a different, or accursed gospel from what Paul was preaching. There is only one way to be saved and it is through faith in Jesus Christ as God who came to earth, born of a virgin, lived a sinless life, preached his message and assembled his team to establish his church so that all the world would know. He was slain horribly upon a cross, he was buried and then rose again after three days in the tomb. His death was for the sins of all the world past, present and future and promises eternal life in heaven for all who will believe in him.
This is the gospel Jesus taught and his apostles then took unto all the world. Their faithfulness to this duty is evidenced by the very fact, 2000 years later, we are still believing, still growing in our faith, still spreading the good news and still bringing glory to God.