Being a Cleric isn't like studying a spell book, or practicing a trade. It isn't a job, or a task you practice at. You have faith, total devotion to your god, so much so that it grants you supernatural powers.
You don't have the faith to get those kinds of powers by being a moderate. You're not just a worshipper, you're a Cleric, a Priest or Priestess, you are dedicated wholly to your God and their machinations.
Worship out of habit isn't gonna do the trick. Worship out of fear doesn't do the trick. You gotta drink the kool-aid and buy in mind, body, and soul.
This is just the worst kind of pigeon-holing a whole class into a single role. Even Paladins can have some doubts (well, maybe you think they can't, I do not know), but for all the clerics be 100% devote from level one? That's bad. You would lose a whole slew of archetypes and twists, and I do not think I want that. You lose the god-gives-power-to-corrupt-cleric cleric, you lose the misunderstanding-cleric cleric, you lose the losing-his-faith cleric.Again, the new restriction is unacceptable. I will change it if the devs don't change it.