I might be mistaken, however I think that Dr. Dawkins was trying to stipulate was the content of the talk by Dr. Tyson at the Beyond Belief conference (2006).

Here is the link to that talk [video]: http://www.youtube.com/watch?v=N7rR8stuQfk

(It is quite long, but in my opinion worth the watch)

TLDW: He presents evidence of the rise of religion being a major if not the major contributing factor to the downfall of critical thinking, most significantly saying that people invoke a religious philosophy of ignorance at the end of their knowledge, and this is quite dangerous to scientific thinking.