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Replying to The Nice Centurion in post #1]
I would say, other than for historical interest, it doesn't really matter if "Paul" existed. Clearly
someone wrote the original letters "from Paul". Was that person's name Paul? Who knows?
Like others have stated, some of the letters "from Paul" do not appear to be from the same author as others so at least some of them are likely not "from Paul" (whether that person's name is Paul or not).
At the end of the day, it kind of doesn't matter since what we are generally concerned about in these discussions is
what "Paul" wrote about not the real name of the author of the original letters.
What matters more IMHO:
1. Are the contents of the letters relevant to establishing any truth about Jesus (since Jesus is the central topic)?
2. Are all the letters from the same author?
Even if Paul never existed, clearly someone did and they wrote some stuff down that is central to a new religion. If Jesus never existed, Christianity is pointless. If Paul never existed, then... well not much changes. Someone had visions/thoughts about Jesus and wrote them down. Whether this someone is named Paul doesn't really matter.