Actually, if I could think of the one thing most likely to make me believe that some rabbi named Jesus lived for a couple decades a couple millennia ago, it would be a growing consensus of Serious Western Scholars™ from Respected Research Institutions™ concluding through Reliable News Outlets™ that there was no such rabbi.
Really though. What could possibly be more reliable proof than such conclusions? Re-translated quotes referencing said rabbi from two thousand years of endlessly re-transcribed European primary sources passed through the hands of the feudal nobility and their despicably untrustworthy learned servants? Absolutely not. Pictures? Photoshopped. Audio recordings? Voxal. Firsthand experience? Actors and sets. Ultra-HD video of Jesus shaking hands with Alan Dershowitz, brought back from a time traveling expedition with accompanying testimony and sworn affidavits from Serious Western Anthropologists™ and Sociozionologists™? Sounds about as trustworthy as Colin Powell at the U.N. A bunch of people swearing that they've talked to this guy Jesus, and felt said rabbi's presence? Clearly unreliable; could be cuckoo, or wishful thinking, but definitely not something to base a logical conclusion on.
When a bunch of western academics start agreeing that there was no Jesus, though, things start to look different. Historically speaking, whatever the academic consensus produces is self-serving, pointless, and, perhaps less importantly, wrong. So however unpleasant it seems, it may be time to start reading Left Behind, people, and praying and all that other shit, because when a Regents Professor at the University of Formerly Mexico gets published in Academic Journals™ and draws the attention of Reliable News Outlets™ for telling us that some guy didn't exist, there's a 100-motherfucking-percent chance that the guy did exist.