Halcon:
You ask this question because you assume that only physical and tangible things are real, ignoring the fact that a person's mind and emotions are just as real as their flesh and blood. The concept of Jesus has nothing to do with a physical man that may have been independently verified by other people or not.
A tedious false equivalence. The problem (for the apologist) is that “mind and emotions” are contingent on ‘flesh and blood’ and can’t be demonstrated to exist independently of them. So the claim that Jesus “has nothing to do with a physical man” only further demonstrates that it is a delusion.