That would be interesting in a game setting... having the one or more 'official' religions that no one really believed anymore but everyone gave lipservice too... offset against another one that had a growing cult of true-believers.
For most of the fantasy games I've played in the religions were pretty much equally powerful and equally correct... meaning all the gods could grant spells/powers... or even show up in person from time to time...
I think the thing about creatures being real/not real... is part of the mystery that's enchanting about playing in lower tech settings... not naming the creature that is seen but merely describing it and letting the players/characters come to all the wrong assumptions... either mistaking a vagrant for bigfoot or believing the sphinx at the gate is only a statue... oops!
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