At the Council of Jerusalem Peter and the rest of the Jerusalem church accepted correction coming from Paul. It is nonsense to claim that Paul was teaching something different- he in fact was the one who corrected Peter’s error.
Your criticism relies on dismissing not only the writing of Paul but also that of Luke, which none of the early church questioned.
John lived longest of all the Apostles, had there been a conflict between the theology of Paul and the rest of the Apostles John had the time to address it. He didn’t. John’s last writing was the Revelation of Christ- did Christ also forget to mention a conflict between the teaching of Paul and the other Apostles? Apparently so if we accept your argument.
The early church was filled with the students of the Apostles, we have volumes and volumes of their ante Nicene father letters, and they wrote nothing about the supposed conflict that you claim exists.
At the Council of Jerusalem Peter and the rest of the Jerusalem church accepted correction coming from Paul.
acts 15
12 Then all the multitude kept silence, and gave audience to Barnabas and Paul, declaring what miracles and wonders God had wrought among the Gentiles by them.