I disagree. This is the mentality Mike Mearls has,
Then I am in good company, I suppose, though I've never met the man.
this is the mentality I'm trying to fight.
Why?
Its very easy to just take a passing glance at D&D's history and say "Clerics follow gods," when every single edition of D&D that I know of says Clerics don't have to worship a single deity, and many champion a whole pantheon, a philosophy, or just an alignment.
Ok, so by your own admission, that would be "every single edition that [you] know of..."
(I don't have any pre-3e books, but 3e, 4e, and every retroclone I've found concur.)
Well then...it MUST be true! Check out some "pre-3e" material when you get a chance.
From the ORIGINAL "Expert Rulebook" by Gary Gygax and Dave Arneson, edited by David Cook and Steve Marsh...
"
Clerics
At the first 3 levels of experience, the power of the cleric is extremely limited. As characters advance to higher levels (possibly as high as 36th), clerics obtain more spells of greater power,
having proven their faith to their god or goddess."
From the 1e PHB...written by Gary Gygax...
"The Cleric
...
This class bears a certain resemblance
to religious orders of knighthood of medieval times. The cleric has an eight-sided die (d8) per level to determine how many hit points (q.v.) he or she has.
The cleric is dedicated to a deity, or deities, and at the same time is a skilled combatant at arms."
*
All emphasis/bold/italics applied by me.
It's easy to house rule either way, of course, but I'd like to have it be an official assumption in the setting.
Well, you are totally entitled to want what you want. No argument here.
But what you want as an "official assumption of the setting" has no correlation to what I view as "D&D."
What you view/perceive as "historical" is hardly but.
--SD