Just so we're clear: "Cthulhu," by any other spelling, is fictitious. Well, at least as fictitious as all the other divine entities concocted, invented, "contacted" and "discovered" by humanity over the years. Hell, I once had a conversation with someone ten years younger than me who was telling me all about the "Religion of the Twelve Dragons" and was baffled when I told her to read "Dragons of Autumn Twilight." I mean, the shit people will adopt as dogma and gospel....
Damnit, I wasn't going to trap this post as a "Theological Thursday," but I went there, so now it goes there.
Ah, well, at least theology guarantees months of material :)