Hello!
I can’t complete the “Sharing the Faith” quest; I’m trying to use /kneel to Supplicant at the Undercity’s War Quarter, however, the quest won’t complete. It is bugged. I can’t proceed…
Quest still not working in Darnassus 
You target and /pray on him. If he is not kneeling then it’s a problem. Not sure but if someone did it recently he may be standing.
The quest isn’t needed really for anything, it just informs you how to share priest buffs.