This is a classic example of the primary error and vulnerability of Protestantism as devolution reoccurs and another sect or cult breaks off. The gospel according to this new sect/cult is that there are (at least) two different gospels, one of Peter and the other eleven apostles, and another of Paul which this sect purports to follow.
Hey af vet, have you heard the good news?
There are not two Gospels, there are two different paths that reach the same Gospel, that which Peter had to be led along and that which Jesus 'estonied' Saul with. There is only the One Gospel. The Catholic Church History might be an excellent example of how God is gentle and long suffering to bring us to a full knowledge ... the many mistakes done by the Catholic hierarchy, done in the name of 'The Church' and working for Jesus, and yet it is that same ekklesia which God has used to bring the Scriptures as they are to us today. And make no mistake here, God is able to have the Bible He wants for us today. And He is long suffering to allow errors to be made in translation that get revealed later in the church age so as to silence heresies ... like the mistranslation of apostasia, used as a wedge between Protestant revolutionaries and the Catholic Church to mean everything from breaking away from mother Church to falling away from the Gospel; but apostasia as used in the day that word made it into the Scriptures meant 'departing'.