Paul didn’t write any gospels. Paul wrote letters. Completely different genres. None of the Gospels was autographed, so we don’t know who wrote them. The “authors” are much later additions. None of the origins of the texts fit the profile of a Galilean follower of Jesus.
Just because Mark got his information from Peter it doesn't make it any less valid.
Who Wrote The Gospels Of Mark & Matthew? | Reasons for Jesus
By Clarke Bates| As a continuation of the earlier article regarding the authorship of the Gospel of John (here), this article will approach the authorship of the second Gospel, attributed to Mark. Of the four gospels, John stands apart as holding the clearest level of internal evidence to attest to its authorship; we continue to Mark as it is considered the earliest gospel, and the one upon which the rest of the Synoptics draw.
It is no surprise that the second gospel falls under intense scrutiny and skepticism, for if doubt can be raised to its authorship or accuracy, that doubt must naturally spread to both Matthew and Luke. While it was stated earlier that the authorship of a biblical text is not a necessary element in demonstrating its truth, it can reinforce the authoritative nature with which it speaks.
What follows is in no way an encompassing discussion on the various challenges to traditional authorship, but a survey of the evidence from which we can draw conclusion regarding the most likely, or plausible author.
The Gospel According to Who?
Just as is the case for the Gospel of John, the Gospel attributed to Mark is formally anonymous. The attestation which all Christians are now familiar stems the formal titles attached to the documents in the second century. “The first reference to the author and circumstances of the second Gospel comes from Papias, bishop of Hierapolis in Asia Minor. . . composed sometime prior to his death in AD 130.”(1)
The original writing of Papias has long since been lost, but was recorded within the writings of the early church historian, Eusebius, in the fourth century. It is from Eusebius’ Ecclesiastical History that much of these earliest works remain extant.
According to Papias, one who lived during the time of the apostles, as recorded, “Mark became Peter’s interpreter and wrote accurately all that he remembered, not, indeed, in order, of the things said or done by the Lord. For Mark had not heard the Lord, nor had he followed him, but later on, as I said, followed Peter, who used to give teaching as necessity demanded but not making, as it were, an arrangement of the Lord’s oracles, so that Mark did nothing wrong in thus writing down single points as he remembered them.
For to one thing he gave attention to leave out nothing of what he had heard and to make no false statements in them.”(2)
If this is, in fact, the case, the gospel of Mark consists of eyewitness accounts from one closest to the Lord. Edwards agrees with this sentiment, writing, “That the Second Gospel was in many respects ‘Peter’s memoirs’ found, as far as we know, unanimous agreement in the early church.”(3),(4)
By examining the Papias quote, three points are illustrated concerning the author of the second gospel:
By no later than the mid 4th century, the second gospel was consistently and unanimously attributed to Mark. While Mark himself was not an eyewitness of Christ, his source for information was, giving the gospel the necessary credentials for canonicity.
- Mark wrote the gospel that, in Eusebius’ day, was identified with his name.
- Mark was not an eyewitness but obtained his information from Peter.
- Mark’s gospel lacks “order,” reflecting the occasional nature of Peter’s preaching.
From our standpoint it might seem odd that Papias would suggest a lack of order to the second gospel, given that it seems orderly in English texts, but what is likely meant by this statement is that it lacks rhetorical or artistic order common in first century compositions, particularly the other gospels.(5)