There exists documented proof in many bits of literature from around 200 BCE to around 100 CE of numerous different figures in what is called ‘Jewish Apocalypticism’, basically a small in number but persistent phenomenon of Jews in and around what was for most of that time the Roman province of Palestine, preaching that the end would come, that God or a Messiah would return or arise and basically liberate the region and install a Godly Kingdom, usually after or as part of other fantastical events.
Jesus was one of many of these Jewish Apocalypticists. Much like the rest of the movement’s key figures, they were wrong, and their lives were greatly exaggerated in either their writings or writings about them or inspired by them.
This seems to be the (extremely condensed) opinion of most Biblical Scholars.
There are a very small number of modern Biblical Scholars that are ‘Mythicists’ of some kind, who believe that Jesus was completely fictional and wholly invented by certain people or groups.
This is an unpopular view amongst scholars and historians of that time and region, as most believe it more plausible that Jesus was just another example of a radical Jewish Apocalyptic preacher, which again, was fairly common for roughly 300 years in that region.
Its like how if you go to a big city theres always that one guy with a megaphone preaching imminent doom. 99% of people think this is silly and ignore them, but tons of people know that people like them exist and do have small followings.