In my view it's not undisprovable when it is a creation of man.Man has been making up stories of origins since time immemorial.If that was the case then we would have to try and disprove Santa etc.No need to disprove obvious myths and folktales.
There is nothing people will not maintain when they are slaves to superstition
http://chatpilot-godisamyth.blogspot.com/
http://chatpilot-godisamyth.blogspot.com/