Your entire religion hinges on the truthfulness of this one man. Is Paul divine? Is he a son of God too?
How do you know he was telling the truth?
Your ignorance is showing again. You would do yourself a favor to actually read the NT before you make statements that merely show ignorance.
Because he remninds his readers that they also saw Jesus after His resurrection -- at one point, as he points out, 500 saw Jesus at one time. If he was lying, he readers were know it.