I'd like to see a better argument from the source in the OP. First, we know from the Old Testament that there were numerous periods of time where the Israelites worshipped false gods, or made images, etc. If you're using that as an argument to say that "therefore Judaism didn't emerge until 100BC", it's a pretty poor argument. It seems like a lot of "absence of evidence is evidence of absence" too, with respect to the baths and washing traditions.