That is precisely what mythers all assert to the last man over at the big RatSkep thread. In fact, you've summed up the myther take on Paul in a nutshell. Each of those four direct Paul refs. (and more) to humans, plain and simple, with plainly human activities, have each been ascribed by mythers to either the one "revelation" (at Damascus or wherever) or to OT Scripture. That's precisely what the mythers do.
Of course, you pile all these Paul refs. up, one on another, and it does get ridiculous very quickly. Occam's Razor, anyone? Thing is, the routine modus operandi of the mythers is to take each small data point in isolation and to refuse to assess any overall data set as a whole, no matter how intricately related. It's a dishonest tactic, of course, but they do that, again and again. By taking each data point in isolation, it's a sneaky way of making it harder to pin them down on overall patterns. That's one big reason why their tactics have so often been compared on other board to those of Creationists, who do precisely the same thing.
Stone