well -one very major assertion is that far from civilisation becoming settled due to use of grain for bread, it became so to allow fermentation to be more conveniently achieved via a grain source.The logic being that as fermentation was utterly central to nearly all ancient cultures as a mode of spiritual enlightenment and of "foodstuff as medicine" ( our modern terms) then the brewer (virtually always without exception a Woman ) would be oracle,technician, priestess, healer.