The problem with this (and related theories) is that the soul believers believe that the soul itself can live and think without the body. Much of thinking is mediated by language. I don't think a believer in soul would accept that their soul after death will be incapable of thought until God provides it a substitute pineal gland.

Actually, the concept of soul without language makes more sense on its own and fits more religious traditions (especially if you abandon literal translations) than souls that have language.