No. While there's nothing wrong with designing an NPC as a PC, I don't think it makes sense in many cases.
If every guard in the campaign is at least a 1st level fighter, then that means they're all proficient in plate mail. Why would Bob, the constable of a tiny, poor fisher town, be proficient in plate mail? He's probably never even seen a suit of plate armor in his life.
IMCs most priests are not clerics. They might be devout (or not) but they can't summon up even the most trivial of miracles. Clerics who can channel their deity's divine power are the exception, not the rule.
Cleric is an idiosyncratic class that probably shouldn't be representative of most clergy, for sure, but that's just a call to design more divine spellcasting classes, and/or more things like paladins that represent different endowments of divinity. I actually use sorcerers as "clerics" more often than not, with clerics largely ending up restricted to whatever deities make sense for their weird spell list.