Bruh I’m not even Christian. All of the events in his life don’t have to be corroborated for him to be a real person. You for example probably haven’t had everything you’ve done recorded but you are certainly a person because there are contemporary accounts of your existence. Jesus from Nazareth didn’t have to be proven to have risen from the dead to be a real man who existed.
Having a combative attitude isn’t gonna make your point dude.