I know there are other posts about whether Jesus was a historical figure or mythical and I've read them with some amount of care. But I think the most convincing argument for me as a non-historian would be some overwhelming consensus among historians, if it exists.
I know the question is borderline within the guidelines of this forum since it's about the state of historical studies rather than directly asking about whether Jesus existed, so my apologies if it really is beyond the pale of this forum, but I figured people here would be equipped to answer it.
So, how academically viable is the theory of Jesus mythicism in modern scholarship?
I'll presume you've looked through the faq, in which is my earlier post, so I'll keep this relatively brief but right on point:
There is zero academic viability to Jesus mythicism in modern historical scholarship on the question of the historical Jesus. In fact, among historians in the field it is considered so ludicrous that most will not bother with the question.
In recent writing on the topic, there are two books that are of interest precisely because they represent that consensus among historians and categorically demolish Jesus mythicism. Those books are Bart Ehrman's "Did Jesus Exist?" and the more recent, but scathing volume by Maurice Casey, "Jesus: Evidence and Argument or Mythicist Myths?".
Casey, in particular, pulls no punches in basically calling out mythicism for being a collection of confirmation-bias, outdated scholarship, and inability to deal with evidence or argument.
This question literally comes up all the time, so I don't really feel like answering it again (No joke, it has come up 7 times in the last 2 months). Like /u/talondearg , I will make reference to a recent post where I spelt everything out in answering a question about references to the historical Jesus
I also with confirm that the vast majority of scholars who teach New Testament across the nation believe in the historical Jesus. This goes for people of all faiths and backgrounds. The governing Academic body which overlooks these professors is a group called The Society of Biblical Literature, and it has over 5,000 members and I don't know of any member who believes in Jesus Mythicism. And I know of only 1 person with a PhD. who teaches new testament that also believe in Mythicism (Robert Price) and he has been highly criticized for his scholarship which many have said is flawed.