As noted above, religion quests may be submitted by any player willing to write up an idea and submit it to
quests@forgottenkingdoms.com.
Regarding quests such as that one though, please remember that it is never merely about the visible gain from the quest. This is true of a number of quests of course, but this one highlights a couple of points.
Quests take too long... just because a quest can't be completed at one sitting does not make it less effective than one that is done in a few minutes with minimal effort.
Quests involve too much walking about... searching out NPCs and objects for quests helps players to learn about places ICly. Learning where shops are, what items they sell and who can be found in the various towns and cities of Toril is often of great importance to newer players.
With both of the above, there is also the interaction with other players that such quests bring. Finding someone who can tell you where a temple is located, tracking down someone with 'locate object' or 'magic mirror' skills to pinpoint what you need, asking folk to accompany you if a journey is long or difficult or just plain boring.
The specific quest noted has a number of purposes and was written to address a need for newer players.
It serves to give information, encourages exploration of Waterdeep, provides a nice IC means for folk to ask questions of other players about the religion system and introduces them to a number of NPCs who they may need later in their playing career.
Not all players have Faiths & Pantheons to hand when they start to look into the idea of religion and the Help Files only give the bare bones so quests like this one are an ideal means of providing the information.
With any of the hundreds of quests in the game, try to look beyond the glory or item reward or the effort involved in completing it. Quest writers give up their free time to enhance the game. Singling out their work because it doesnt exactly meet your view of how the information could best be imparted is impolite to say the least.