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S1 Tomb of Horrors by Gary Gygax
S2 White Plume Mountain by Lawrence Schick
S3 Expedition to the Barrier Peaks by Gary Gygax
S4 Lost Caverns of Tsojcanth by Gary Gygax
These four were later (weakly) combined into supermodule:
S1-4 Realms of Horror
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The purpose of writing up religions for role playing games is so that players can use those religions for their characters. Gods should not be "monsters" to fight with, so their combat stats are totally unnecessary.
When you discuss religions, even relgions that are essentially dead, you are discussing people's cultural heritage, and mythology that shapes their world view. It is insulting to write up these religions in a ignorant and wildly inaccurate way. It is even worse when you do this with religions such as Hinduism that millions of people believe in. If they had of written up Yaweh as having 400 hit points and the powers of a 20th level mage, and Jesus as a "Lesser god," with some kind of write up about how he is the god of healing, it would be obvious how strange and offensive this is.
If you want to use historical religions in your campaign, then go to the library and learn about them. If you want to use fictional ones, then make them up. Either way, this book is not useful.
On the other hand, it's a good book, because it let's a DM see exactly how he/she should write up gods he/she creates. It also is a good referance for learning who the gods are throughout mythology.