Well, ... Paul is of course famous for have met an already dead Jesus in a vision on the road to Damascus. That was clearly fiction, was it not.
Paul never claimed that. The author of Luke/Acts writes two fictional versions of Paul's conversion, which are contradictory.
Paul just says he saw a vision -- which may well be true -- but is shy about the details.
I suspect, although this is pure speculation, that he was converted in the way he went on to convert others, by a charismatic baptism experience.
He takes great pains to insist that he didn't learn about Jesus from James or the Twelve, because if he had then he would be subordinate to them, and if there's one thing Paul wants you to know, it's that he's not subordinate to anyone else in the Jesus movement.
If he were converted by the method he used for conversions (which makes the most sense) then it also makes sense that he would choose not to explain the details of that event beyond his vision, because according to him it was Jesus who recruited him… if that happened during a baptism, well, it wasn't because of the power of the baptizer, but because Jesus chose him.
But like I said, that's just my speculation about how he might have actually been converted.
In any case, he doesn't say what happened. Only that Jesus converted him directly, somehow.
In Corinthians, I believe Paul also refers to a vision he had when transported to the what he claimed was the third heaven. That too would of course be fictional.
Not necessarily. People do have ecstatic experiences, which are real, even if they aren't actually indicative of anybody being transported to any other plane.
In that passage, Paul is presenting his bona fides, against a charge that he wasn't the real deal because he didn't have visions, which a true apostle should have.
Everything that Paul tells us about Jesus was apparently revealed to him directly by the lord himself. That is fictional isn’t it.
Well, the claim you're making there is fictional.
Paul says he was familiar with the Christians and what they said about Jesus before his conversion, and of course he talks with James and John and Simon Peter who all knew Jesus and would have learned about his life from them.
From what Paul write in Corinthians, it’s seems clear that Paul is preaching the same message found in the books of Enoch and Proverbs, where Paul associates Jesus with the notion of God’s “Wisdom” presented as a “hypostasised personified figure”. That sort of belief is fictional, isn’t it? (see for example Ellegard, Jesus, One Hundred Years Before Christ, p17).
The accounts of Paul, in so far as they make mention of Jesus, are not historical earthly records, but fictional visionary beliefs.
You've got it backwards. Paul warns AGAINST those who preach "wisdom"
There is a passage in which Paul recites an early Christian hymn, and that passage is often glommed onto by the mythicists, but it can't stand up against his clear statements that Jesus was born of woman as a Jew under the law and he ate and drank and died.
But in any case, back to the question of whether his letters are "pure fiction", keep in mind that most of the letters are discussing church policy, sending greetings, discussing travel arrangements, settling disputes, answering charges, explaining his mission work, asking for support, and so forth.
So no, his letters aren't works of fiction, even though not everything in them is true.