Yo yo Mr. Millenium Falcon...ah The God Delusion, great read. That book set off a tornado of thoughts and ideas for me. What do you think of it so far?
Having been breast fed WT doctrine from birth, can't say I recall thinking that religious diversity was directly because of Babel. But for the reasons already stated above the WT probably consider it a starting origin.
Of course they're full of sh*t on that because Babel is just fable. The Bible places the events of its Tower of Babel story around 1000 BCE. Reality is there were many spoken and written languages prior to the Tower of Babel events. The oldest known text in the Sanskrit language, the Rigveda, dates to 1700-1100 BCE. Egyptian hieroglyphs date back to about 3100 BCE and Sumerian writings date as far back as 3200 BCE.