The Forgotten Realms Wiki is quite the source of information. But it does seem to leave a few things wanting when it comes to naming folks devoted to such-and-such deity.
Corella's picked up something of a nasty habit: Every time she kills a half-dragon cleric, she loots her Priest's Robe, runs it over to the next tailor in her path, turns it into a priestly garment of the Church of Such-and-Such God and adds it to her Armoires of Disguises +5. Ilmatari Priest's Robe? Check. Loviatan Priest's Robe? Check. Cyricist Priest's Robe? Well, she used a Necromancer Robe looted from some dumb Wizard Mercenary for that one, but check. Then it came time for the Kossuth...Kossuthite...Kossuthian...what the heck are those guys called, anyway?
The Wiki's good for filling in most of the blanks, but still there are fuzzy spots that the Wiki doesn't cover. Maybe y'all know something that I and the Wiki don't. So whadayasay we work together and make some of these question marks disappear, eh? :)
(Deity - Faithful)
Akadi - Akadian
Auril - Aurilian
Azuth - Azuthan
Bane - Banite
Beshaba - Beshaban
Bhaal - Bhaalist
Chauntea - Chauntean
Corellon Larethian - ?
Cyric - Cyricist
Deneir - ? (if worshipper) or Deinerrath (if clergy)
Eilistraee - Eilistraeean
Eldath - Eldathyn
Gond - Gondar
Gorm Gulthyn - Vigilant (if worshipper) or Barakor (if clergy)
Grumbar - Grumbarryn
Gruumsh - Gruuman
Helm - Helmite
Ilmater - Ilmatari
Istishia - Istishian
Jergal - Jergali
Kelemvor - Kelemvorite
Kossuth - Kossuthan
Lathander - Lathanderian (in general), Awakened (if worshipper) or Dawnbringer (if clergy)
Leira - Leiran (worshipper, clergy, in general) or Worshipper of the Mistshadow (if clergy)
Lliira - Lliiran (if worshipper) or Joydancer (if clergy)
Lolth - ?
Loviatar - Loviatan
Malar - Malarite
Mask - Maskarran
Milil - Mililan (if worshipper) or Sorlyn (if clergy)
Moradin - ? (if worshipper) or Sonnlinor (if clergy)
Mystra - Mystran
Nobanion - Nobanionite (in general) or Pride of Nobanion (if clergy, either singly or collectively)
Oghma - Oghmanyte
Red Knight - Red Fellowship (if clergy, used only collectively). No known concise terms for worshippers or single priests.
Savras - Savathan (in general) or Divinator (if clergy)
Selûne - Selûnite
Shar - Sharran
Sharess - Sharessan or Sharessin
Shaundakul - Shaundakun
Shiallia - Shiallian (if worshipper) or Brother/Sister of Life and Mercy (if clergy)
Siamorphe - Siamorphan (in general) or Scion of Siamorphe (if clergy)
Silvanus - Silvanite
Sune - Sunite
Talona - Talonan (if worshipper) or Talontar (if clergy)
Talos - Talossan or Talassan
Tempus - Tempuran
Tiamat - Tiamatan
Torm - Tormish or Tormite (if worshipper) or Tormtar (if clergy)
Tymora - Tymoran
Tyr - Tyrran
Umberlee - Umberlant
Velsharoon - Velsharan
Waukeen - Waukeenar
Whoever the heck else I overlooked here.
That's it. Inform, cite, refer and speculate at will.
Corella's picked up something of a nasty habit: Every time she kills a half-dragon cleric, she loots her Priest's Robe, runs it over to the next tailor in her path, turns it into a priestly garment of the Church of Such-and-Such God and adds it to her Armoires of Disguises +5. Ilmatari Priest's Robe? Check. Loviatan Priest's Robe? Check. Cyricist Priest's Robe? Well, she used a Necromancer Robe looted from some dumb Wizard Mercenary for that one, but check. Then it came time for the Kossuth...Kossuthite...Kossuthian...what the heck are those guys called, anyway?
The Wiki's good for filling in most of the blanks, but still there are fuzzy spots that the Wiki doesn't cover. Maybe y'all know something that I and the Wiki don't. So whadayasay we work together and make some of these question marks disappear, eh? :)
(Deity - Faithful)
Akadi - Akadian
Auril - Aurilian
Azuth - Azuthan
Bane - Banite
Beshaba - Beshaban
Bhaal - Bhaalist
Chauntea - Chauntean
Corellon Larethian - ?
Cyric - Cyricist
Deneir - ? (if worshipper) or Deinerrath (if clergy)
Eilistraee - Eilistraeean
Eldath - Eldathyn
Gond - Gondar
Gorm Gulthyn - Vigilant (if worshipper) or Barakor (if clergy)
Grumbar - Grumbarryn
Gruumsh - Gruuman
Helm - Helmite
Ilmater - Ilmatari
Istishia - Istishian
Jergal - Jergali
Kelemvor - Kelemvorite
Kossuth - Kossuthan
Lathander - Lathanderian (in general), Awakened (if worshipper) or Dawnbringer (if clergy)
Leira - Leiran (worshipper, clergy, in general) or Worshipper of the Mistshadow (if clergy)
Lliira - Lliiran (if worshipper) or Joydancer (if clergy)
Lolth - ?
Loviatar - Loviatan
Malar - Malarite
Mask - Maskarran
Milil - Mililan (if worshipper) or Sorlyn (if clergy)
Moradin - ? (if worshipper) or Sonnlinor (if clergy)
Mystra - Mystran
Nobanion - Nobanionite (in general) or Pride of Nobanion (if clergy, either singly or collectively)
Oghma - Oghmanyte
Red Knight - Red Fellowship (if clergy, used only collectively). No known concise terms for worshippers or single priests.
Savras - Savathan (in general) or Divinator (if clergy)
Selûne - Selûnite
Shar - Sharran
Sharess - Sharessan or Sharessin
Shaundakul - Shaundakun
Shiallia - Shiallian (if worshipper) or Brother/Sister of Life and Mercy (if clergy)
Siamorphe - Siamorphan (in general) or Scion of Siamorphe (if clergy)
Silvanus - Silvanite
Sune - Sunite
Talona - Talonan (if worshipper) or Talontar (if clergy)
Talos - Talossan or Talassan
Tempus - Tempuran
Tiamat - Tiamatan
Torm - Tormish or Tormite (if worshipper) or Tormtar (if clergy)
Tymora - Tymoran
Tyr - Tyrran
Umberlee - Umberlant
Velsharoon - Velsharan
Waukeen - Waukeenar
Whoever the heck else I overlooked here.
That's it. Inform, cite, refer and speculate at will.
Corella d'Margo, arch-liar
Wyren Caul-of-Amber, alchemist
Tirah Het-Nanu, courtesan
Wyren Caul-of-Amber, alchemist
Tirah Het-Nanu, courtesan