Argument: Paul's conversion is inexplicable if Jesus were fictional — he was in Jerusalem at the same time as the crucifixion

If Jesus were a mythical/fictitious figure, it strains credulity that Paul — who persecuted Christians, was in the same city at the same time as the crucifixion, and knew people directly connected to Jesus — would convert on such thin evidence. His personal proximity to the events makes fabrication implausible.