I'm sorry but even if not believing Jesus's being God's son, it impossible to doubt his having really lived. There are allusions to what happened to him in Latin texts.
For example : Tacitus Annals, 15th book, chap. 44 : " Nero [...] quaestissimis poenis adfecit quos [...] vulgus Christianos appellabat. Auctor nominis ejus Christus Tiberio imperitante per procurationem Pontium Pilatum supplicio adfectus erat".
=> "Nero sentenced to the most refined punishments those the rabble called "Christians". The one from whom the name comes, un certain Christus, had been sentenced to supplicium execution by the procurator Pontium Pilatum, while Tiberius was emperor."
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