The only way to insert a historical character into a fictional story and be able to prove this to be the case is that a real and verifiable story with that person in it must also exist or his own records must be located and verified. When you don't have that, you don't have a case for saying the person is historical even if the story is obviously not. Since we have no verifiable biography or history of Jesus Christ other than the fictional story, it is great folly and totally dishonest to assert then that the character is real but the story false. The very idea is absurd. Until a verifiable story pops up for comparison, both persona and story must be considered fictional. Jesus Christ is fictional--period.