Recently I have commented and posted on religion in the world of D&D with sources seeming to be in short supply.
After trying several online indexes to look up material printed in the magazines I have found most lacking. So I decided to index my collection and was amazed at how much material is available.
I don't know how deep I will get to go down this rabbit hole but I'll start here.
From the first 50 issues of The Dragon:
Dragon #12 The Persian Mythos
Dragon #12 The Druids
Dragon #13 The Japanese Mythos
Dragon #16 Near Eastern Mythos
Dragon #17 Angels in D&D
Dragon #19 Mythos of Australia
Dragon #28 The Politics of Hell
Dragon #29 Of the Gods
Dragon #29 The Mythos of Oceania in D&D
Dragon #29 Origins of the Norse Pantheon (added-03-20-11)
Dragon #32 The Druid in Fact and Fantasy
Dragon #33 Clerics & Swords
Dragon #35 Angels in Dungeons and Dragons (2)
Dragon #39 Try this for Evil: The Anti-Paladin
Dragon #39 Next Time, Try a Cleric
Dragon #41 Reflections of a Real-Life Cleric
Dragon #42 Demons, Devils and Spirits
Dragon #42 The Possessors
Dragon #42 Patron Demons
Dragon #48 The Druid and the DM
Dragon #48 Druid in a Dungeon? Why Not?+
If I missed something let me know so I can include it. Now I just need time to go through #51-100