Originally Posted by
Wilde woman
Language has never been "just words". Since ancient times, there have been words that do things (performative language, as John Austin would say). Most rituals have a linguistic element that must be adhered to to evoke the desired result. For example: magic spells. Say the wrong words and the spell doesn't work.
From there, I think it's a short step to blaspheming or sinning through speech.
Gosh, this sounds exactly like a paper I wrote on Dante several years ago.