Actually if the world had no religion it would be unable to come back. People would not even have thoughts of worshipping anything. Thus his third statement is rather solid. Even makes tons of sense linguistically. Can't shoot him down...
That most likely isn't true. There was a point when the world had no religion, and then someone used religion to explain what they didn't understand (lightning, rain, whatever.)
The only way I could see religion ever being gone completely is if humans were to explain and understand everything there is to know. As long as there are unknowns, people will explain them with religion. It's the easy way out, basically, rather than trying to figure out what is true.
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