You try to invent or to sustain a nice religious story based on a totally inadequate premises. I have nothing against any religion but I really don't like anyone that pretend is the one who know the true and in fact he is just a half-scholar.
And no, there is no basic difference between Swiss German, Swiss French or Swiss Italian. Are the same languages with some regional modifications. There are languages, dialects and regionalisms. Swiss spoken languages are not even dialects.....
I agree it is OK to present anything as a nice story, even if it is a fiction, but why to accept a stupid fiction, when there are a lot of others at a better quality, that are not promoted because the world is filled with such low quality.