Professor James McGrath is a parallelomaniac. Every time he sees an argument for a parallel that he does not like or from which the author draws an uncomfortable conclusion he claims that the parallel is actually a parallel to Samuel Sandmel’s notion of “parallelomania”.
Samuel Sandmel introduced the term “parallelomania” into English-speaking New Testament studies and explained it as that “extravagance” where one took excerpts out of context from some source and applied them willy-nilly to a text under study. It could also include one making much ado about real parallels if they were also quite meaningless (e.g. We would not be surprised if two different Jewish texts spoke about God and Moses, so we cannot assume one is copying from the other in such a case.)
I spelled all this out in my recent post explaining the difference between legitimate parallels and parallelomania. The same post links to the original 1962 article by Samuel Sandmel.
How do we know a parallel is potentially legitimate and not “parallelomania”? Sandmel was very clear. Detailed study is the most essential criterion of a genuinely plausible parallel; the actual words used, the syntactical structures, the contexts, the larger argument structure, the literary culture in which the act of copying is alleged to have occurred, etc. Sandmel even wrote that he encouraged such studies that helped us identify genuine cases of literary borrowing.
What he warned against was taking excerpts (words and phrases) out of their contexts and fortuitously applying them to the target text. I have been showing (in some comments here but especially in discussions on the EarlyWritings forum) that this is the flawed methodology that in many cases makes D.M. Murdock’s (astrotheology’s) arguments invalid.