This makes me think... I wonder if it was someone's attempt at some kind of in-joke about stereotypes. Between the timing of the episode and the Necronomicon (i.e. a fictional book, completely made up by Lovecraft as part of the mythos of his work, which is often purported to be a real grimoire)... And it's sort of a stereotype that obviously all pagans are ren-faire types too...
I dunno. I'm feeling like there's some kind of connection here that we're just not getting, but I may be wrong.
Part of our personal humor was based on our observation that there are a LOT of pagans deeply involved with the ren faire scene, BUT there are some very Christian people too. Historical re-enactment generally doesn't hang on your religious beliefs.
And to answer another question, if a Christian prayer room had been discovered, it would have been just as weird. It felt like a plot line had been started but not finished.