Yes. Yes, it is, actually.
Rather than explaining all the scientific, anthropological and linguistic processes and blabbety-blah, just say "The gods made it so."
Problem solved, you're welcome.
The only reason you deny the simplicity is your diametric opposition to religion/God in general; otherwise, either means of explaining the language divide is acceptable/viable, and you know it.
“…Judge not what a man has done, but judge what he could have done if he was a different bloke altogether. For art thou a leper? And a leper can changeth his spots…” --Rudy Wade, Misfits (Series 4, Episode 8)