What if the 'Jesus' Paul claimed to have seen, was actually a demon in disguise, as the Christians claim about Samuel's ghost?
Islam doesn't believe in ghosts. In 1 Samuel 28, the witch of En-dor supposedly brought up for king Saul the ghost of prophet Samuel, who looked like him and made a true political prophecy. The Old Testament context treats this as the real Samuel, but some Christians deny the concept of ghosts (as they should) and say it was a demonic ruse, a trick, and the prophecy was a lucky guess. Fine. They are reinterpreting the uncomfortable parts of the Tanakh, using mental gymnastics that contradict the gist of the story (as usual!), but their interpretation throws doubt on many other apparitions! They can't attack Islam by claiming that Muhammad's angel, Gabriel, could have been a demon (that curses demons and promotes monotheism?! Hah!) without locking themselves into saying the same about Paul's encounter! In 1 Corinthians 15:8 Paul said: "Last of all, as though to one born at the wrong time, he appeared to me also"