Most antiquities scholars think that the New Testament gospels are "mythologized history." In other words, based on the evidence available they think that around the start of the first century a controversial Jewish rabbi named Yeshua ben Yosef gathered a following and his life and teachings provide...
I think the historical signifigance of jesus lends more credibility to his existence, its just his supernatural abilities that are not credible theories
Arthur Pendragon has a lot of historical significance as well.