Here goes Dan'l with his nutty theory again...
My ongoing theory is that one of Wolfe's basic themes/memes/working
methods is to embed non-Christian cosmologies into larger Christian contexts. That is, in these novels Christianity is ultimately true but some other belief system functions locally as if it were true.
The most blatant example of this is "Long Sun," which is explicitly a Gnostic world (the Whorl) contained inside a larger universe in which Christianity is true (i.e., the Outsider is the Christian God). Only slightly less straightforward are his embedding of Norse (TWK) and Greek (Latro I & II) pagan cosmologies into the Christian ur-context.
I've argued this at length.
So I don't suppose anyone on this list will be terribly surprised when I suggest that, in AN EVIL GUEST, Wolfe has similarly embedded Lovecraft's cosmology into the Christian ur-context. That Squiddie (Cthulhu) and R'lyeh and other Lovecraftiana are real in the novel seems beyond dispute. The cultists practice Lovecraftian nihilism, and it is "locally true" -- as long as they are under the influence of the GOOs, it may as well be true.
This needs fleshing out, but I'm putting it out as a starting point to be attacked and developed.
Dan'l Danehy-Oakes, writer, trainer, bon vivant
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http://www.livejournal.com/users/sturgeonslawyer
http://www.danehyoakes.com
I once absend-mindedly ordered Three Mile Island dressing in a restaurant and, with great presence of mind, they brought Thousand Island Dressing and a bottle of chili sauce. -- T. Pratchett