To your first point, no one is free of bias, but it’s not the Middle Ages dude. People are free to not be Christian or to criticize or contradict Christianity, and they do all the time. Even non-Christian historians agree that Jesus likely existed.
Between the canonical and apocryphal gospels there are a good amount of people who wrote about Jesus for decades after his death. In my personal opinion as an armchair historian it just seems more likely that early Christian writers, intentionally or not, mythologized a real person that people already knew existed rather than invented one whole cloth.
To your first point, no one is free of bias, but it’s not the Middle Ages dude. People are free to not be Christian or to criticize or contradict Christianity, and they do all the time. Even non-Christian historians agree that Jesus likely existed.
Between the canonical and apocryphal gospels there are a good amount of people who wrote about Jesus for decades after his death. In my personal opinion as an armchair historian it just seems more likely that early Christian writers, intentionally or not, mythologized a real person that people already knew existed rather than invented one whole cloth.