The consensus among historical scholars is that some itinerant preacher who we can reasonably call the historical Jesus existed. That is the state of the field. There was lots of religious fervor at the time, it was already probably clear to everyone that something bad was going to happen to the Temple, there were lots of similar guys running around.

Arguing that the man probably existed is not arguing that he advocated for the things he was saying in the Bible, that he was in any way divine, or that one should believe in Christianity. It’s not arguing for leftist hippie Jesus either. Just that at this point in history, some sort of Jewish rabble rouser claimed to be a messiah and started a small group of followers. This is not a crazy claim - rabble rousers exist, Jewish people exist and have a complex religious/political figure called a messiah, and the group of followers was causing problems in less than a hundred years.

Remember that historical argumentation and proof looks fundamentally different than argumentation and proof in physics or math. You can’t do “Josephus minus The Testimonium Flavianum plus Pliny’s letters equals Christ.” No one is going to be able to trot out a photo of Jesus. Although here’s something fun: here’s one of the first depictions of Jesus.