If Jesus Christ was born again, what would he have to do for people to believe it was him?

I am curious as to what it would take for people to believe since the bible says it must be unquestioned faith. I am not saying I believe in Jesus Christ or not, I am simply curious as to what people would think if someone went around claiming to be Jesus Christ. I personally think IF in fact he came back to life, there would be no way for people to believe because they would always question him and think that he was crazy. Just wondering what everyone's thoughts are on this.