James McGrath gets points for snark when he provides this as the interpretive rule employed by those who believe Jesus never lived, "All things being equal, the simplest explanation is the best one, unless a more complicated one supports mythicism." Exploring Our Matrix: Godfrey's Razor and Historicized Scripture
Although I probably was exposed to it before, for me the most important presentation of the notion that the human being Jesus of Nazareth never existed was in Steve Gibson's book A Secret of the Universe. It is a good book and Steve is a great thinker. I was underwhelmed by the notion as presented there, although this is a novel so it isn't really trying to convince people of the notion either. Since then, I think McGrath's teasing of one of his commentors sums up my take on the topic.