Mercule said:
I may be incorrect, but (as an example) I don't remember the expanded demi-human pantheons (Clengedin, Aerdae Faenia, etc.) being in FR originally. They were ripped from Greyhawk. Even if they were in there, they (and even Corellon Larethian and Lolth) shouldn't be any more than Pelor or Wee Jas should be -- they're all Greyhawk gods.
The demihuman pantheons come from a series of articles written by Roger E. Moore in
Dragon #58-63 and reprinted in the 1e
Unearthed Arcana. These weren't Greyhawk articles; when they mention other deities the races might worship, the examples are from real-world pantheons like the Greek and Celtic. Gary Gygax later said in
Dragon #71 that "Roger Moore did such a splendid job with the non-human deities (see DRAGON issues #59-63 [sic]) that I have urged TSR to include them in the next edition of the DEITIES & DEMIGODS™ Cyclopedia, whenever such a revision takes place. Meanwhile, you should most certainly regard the work as 'Official'! (Those AD&D players who are employing the WORLD OF GREYHAWK™ setting for their campaign can likewise incorporate this material into their activities if they so desire, although some alterations should be made to make sure the non-human deities reflect the WORLD OF GREYHAWK mode, as presented in several previous issues of this Splendid Journal.)"
So they were official demihuman gods for all of D&D (however that makes sense) before there were any details of their Greyhawk existence. Moore seems to have made Corellon, Moradin and the rest the heads of the pantheons simply because they were presented as the chief gods of their races in the 1e
Deities & Demigods "Nonhuman's Deities" section. I believe the introductory notes for that section present them as default gods to be used by DM's in their homebrew worlds, and I don't think their descriptions were Greyhawk-specific. I can only check the
Legends & Lore reprint at the moment, so I can't be sure the relevant text was the same. If anyone reading this has the 1e
Deities & Demigods, please contradict me if I'm wrong.
However, it was obviously decided for whatever reason that FR should go with what were being promoted as the generic and "official" D&D demihuman pantheons.