I am not an expert (in anything lol) but as far as I am aware recent studies by molecular biologists show that genes don't work that way, there are in fact many arguements as to what actually constitues a gene.
It seems a bit simplistic to suggest that there is a gene for alcoholism in the same way it is simplistic to suggest there is a gene for overeating or gambling.
There may be, like I say I am certainly not any kind of expert.
I do know that your genetic makeup controls your biological reactivity to various chemicals so it seems sensible that alcoholism could be in some way passed from generation to generation, not only favourable traits get passed on.
However I also feel you cannot study alcoholism with using anthropological analysis as culture and society surely play a large part in our behaviour.
Sorry about waffling on to make the point that spirituality also plays no part in my addiction or recovery simply because it plays no part in my life.