( Note: I have seen many Atheists, Apostates and Muslims attacking the bible by basing themselves on misinterpretation about the Apostle Paul. Paul was never a False Apostle.)
"Another false idea is that Paul’s Gospel was different from that preached by the other Apostles. This view claims Paul preached a different Gospel because he refers to his message as “my gospel” (see Romans 2:16 and 2 Timothy 2:8) and in Galatians 1:11-12 he stresses he did not receive it from man but by divine revelation.
Another wrong view teaches that the other Apostles preached a partly legalistic version of the Gospel in the early period from the Day of Pentecost up until the time recorded in Acts Chapter 15. This latter view claims because Peter mentioned repentance as an accompaniment of receiving salvation through Christ in Acts 2:38-39 and 3:19-20 that this was a different Gospel from the one Paul later preached.
Such claims are misleading. Acts 15:1-34, Galatians 2:1-10 and 1 Corinthians 15:1-11 show Paul and the other Apostles agreed they all preached the same Gospel. 2 Peter 3:15-16 reveals the Apostle Peter totally approved of what Paul preached and wrote in Paul’s Biblical letters. The Apostle Paul also preached repentance as a part of the Gospel of grace in Christ Jesus (see Acts 17:30, 20:21, 26:15-20 and Romans 2:4).
Such ideas about Paul’s supposed different Gospel are similar to saying that because the Apostle John not once mentioned the word “Gospel” in the Book of John, 1 John, 2 John and 3 John, then this means John did not believe in the Gospel taught by the other Apostles and instead had his own form of teaching. John uses other Biblical expressions which mean similar things to the Gospel. For example, John spoke of grace in John 1:14, 16 and 17 and the kingdom of God in John 3:1-8.
Even though the various New Testament writers wrote with their individual styles and vocabulary, the Holy Spirit inspired them all (see 2 Timothy 3:16). They all preached one Gospel in differing ways. Paul brings out more fully the details and practical implications of the Gospel than do the Books of Matthew, Mark, Luke, John, Acts, James, 1 Peter, 2 Peter and Jude."
"Paul, an apostle, (not of men, neither by man, but by Jesus Christ, and God the Father, who raised him from the dead;)" -Galatians 1:1