Eh Buddy Hoser

It's a little more complicated. There were a bunch of messianic cults at the time so it's likely a bunch of stories about multiple leaders were eventually all attributed to Jesus. And while there isn't any definitive proof the man existed, there's enough reasonable evidence that a guy called Yeshua from Nazareth existed that led a messianic cult, and more there's nothing that disputes the evidence of a man existing. But that's like saying we have evidence a guy called Bob from Newport existed, it was a common name. Anyway it's more there's nothing disproving his existence so there's no reason to think a guy didn't exist.