@mark noble,
If we evolved we were once nothing more than dumb animals. We learned to talk and in the beginning was "the word".
You don't need evidence to know this, all you need is simple induction.
And what is the evidence I have that history exists? Books?
The first human words were (speculatively) pure and unadulterated by religious motivations, governments or one's own manipulative will.
Thus the term is used going "back to the garden"...
The assumption is in the garden there was a pure language that was changed and obliterated by evil over time.