Dude, I’m Jewish. 
I don’t believe that Jesus actually physically existed either, for the reasons that you state, plus my own upbringing. I’m fairly sure, as are most serious scholars, that the Jesus figure of the Christian Bible is an amalgamation of oral tales of a number of itinerant gadfly rabbis from the time period that were written down and syncretized by their various disparate followers a generation or so after they died, and were then edited by the subsequent cult over the next few centuries into the final canonized form as they split from mainstream Judaism. Given that we have Roman court documents for petty thieves’ sentences, and yet nothing for a Yeshua of Nazareth’s apparently high-level sentencing, that’s pretty indicative on its own.
However, that’s not what I was referring to when I said “Jesus Christ is dead” in that post. What I was referring to was that the religious image of Jesus has had the ideals, morals, and social concepts that are key and core portions of the actual teachings of the Christian religion removed, and replaced with a faith that I have dubbed “The Church Of Mammon”.
