No, no one does believe that Paul physically met Jesus. He was very clear to explain the encounter. What he heard and saw and how it affected him.
You are correct. All of those other things purportedly happened. The question is what does one believe. Do we look at all stories and consider them to be equal and correct? We look at other factors and we include them in our analysis and determination. Again, it’s not a formula, it’s a threshold of believability. Different evidence is going to affect people differently. There are reasons why I reject the other two stories you mentioned. Not because I believe the third, but in juxtaposition to the third. For instance, the story of Jesus is supported by a tradition of prophecy that went back a thousand years prior. Neither of the others can say anything similar.