During the "Free Home Bible Study" phase of my Indoctrination into the JWs, I recall being assured that "all the world's false religions" could in fact be traced to the ancient city of Babylon.
There was indeed a school of thought called "Pan-Babylonialism", which had a certain following around the turn of the 20th Century. However, that idea has long since been discarded - almost to the point of being considered pseudoscience. There is also Alexander Hislop's The Two Babylons, which advances similar ideas, but which was soundly debunked even during Hislop's own lifetime (circa. the mid-19th Century). Just the same, the JWs used to treat that work of Alexander Hislop as having almost the final say on the matter!