The year before his book on the subject was published, Shirley Jackson Case wrote an article on the question of the historicity of Jesus. I suspect that few modern mythicists have read either. But the article is now available for free online, courtesy of JSTOR. Take a look at it, see how many mythicists there were a century ago, and then let me know if you think that recent claims of a mythicist “resurgence” are justified in our time, as opposed to in 1911, when the ideas were not new but had seen a growth in the attention they were getting from scholars.
S. J. Case’s book on the topic is also online, thanks to the Internet Archive.