You might be able to import the fluff (and crunch) from the 2E Forgotten Realms books for the purpose, titled: "Faiths & Avatars" (1996), "Powers & Pantheons" (1997), and "Demihuman Deities" (1998).Content: F&A contains all of the greater, intermediate, and lesser human deities of the Faerunian pantheon; P&P contains the rest of them, including demigods; and "DD" contains the non-human pantheons.
They're written by Eric L. Boyd (with Julia Martin on F&A; with Kate Grubb and Skip Williams on P&P); and each book is 192 pages of stuff.
You could do a lot worse. I got my copies on eBay, but Amazon has them all, both New and Used.
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