Several faiths still have no acting faith managers, or faith managers that are often busy with other projects.
If you are interested in becoming a faith manager, sending an application is not really the best way to go. Instead, act like one... roleplay your character often enough, make him/her behave with the deity in mind, interact with others and especially with other followers, suggest faith-based roleplays and gatherings, and so on.
If you do that regularly enough, you will be spotted sooner or later, and perhaps given tasks like questing others and so on.
Happy roleplaying!