"Peter couldn't even read"? You've got to be kidding.
1. His excellent and articulate epistles (two) are proof that Peter could definitely read, as well as write well under divine inspiration.
2. He had read all of Paul's epistles and called them "Scripture". An "illiterate"?
3. Christ asked him a question about what was written regarding the temple tax. Unless he had read the OT, how could he have been asked this?
4. It is a common erroneous belief that Peter provided the source materials for the Gospel of Mark. That is TOTAL NONSENSE. Each of the Evangelists was divinely inspired individually.
5. Also Peter and his brother were wealthy fishermen before they left off fishing to follow the Lord.
6. Also, Luke didn't go around making inquiries before he wrote the Gospel of Luke. He says he received his words "from above" (Greek anothen). Even the KJV translators missed this, as do all the other translations. They all say "from the vert first". or "from the first" or "from the beginning". But Strong's already gave them the PRIMARY meaning, and they all went for the secondary meaning.
Strong's Concordance
anóthen: from above
Original Word: ἄνωθεν
Part of Speech: Adverb
Transliteration: anóthen
Phonetic Spelling: (an'-o-then)
Definition: from above
Usage: (a) from above, from heaven, (b) from the beginning, from their origin (source), from of old, (c) again, anew.
Do you see how everything has been twisted?
Could I be mistaken on Peter's being illiterate? I'm open to the possibility though I don't feel like you make a sufficient case.
It was common then to have scribes take dictation, and even the well-educated Paul seems to indicate as much going on in Galatians 6:11. Acts 4:13 specifically calls Peter and John uneducated and untrained. Young's Literal even uses the term 'unlettered.' And just as Jesus was handed the scroll to read to the people at synagogue, there may have been other ways for illiterate people to hear God's word and know what was written. Plus, composition is a very different skill from literacy. As a teacher I have had students that were reading delayed due to disability, and yet when they finally had the tools they were immediately incredible writers.
While Peter being the alleged source for much gospel material, particularly Mark, is tradition rather than the Bible itself, your comment that each of the evangelist was divinely inspired individually suggest ignorance of how such things actually work. I know because you are speaking of some of my actual gifts. Rather God works
with the person, guiding the input which naturally comes from their own experience. This includes study, as I have myself even had God give me a personalized course on addiction when I would need it for a job he was taking me to a year later.
And I I'm curious where you came up with the idea that they were wealthy fishermen. Again, I'm not closed off to the idea but you have to make a convincing case. Do you actually have a scripture to back that up because I have never had that impression in my Bible reading? Even if they were wealthy, it's no guarantee that they were literate, though I will agree it's more likely. Considering the verse in Acts, though, even if we counted literacy separate from education, why would they have gotten only the literacy and not the education?
Acts 4:13 NASB1995
[13] Now as they observed the confidence of Peter and John and understood that they were uneducated and untrained men, they were amazed, and began to recognize them as having been with Jesus.
Acts 4:13 YLT98
[13] And beholding the openness of Peter and John, and having perceived that they are men unlettered and plebeian, they were wondering — they were taking knowledge also of them that with Jesus they had been —