A whole bunch, says Richard Dawkins:
As it happens, I have just been sent some recent figures for sales of The God Delusion in English:-
North America 907,161
Rest of World 1,179,241
Total English language 2,086,402
That’s impressive even for bestsellers.
Though, to keep things in perspective, Rick Warren‘s awful The Purpose Driven Life has sold 25 million copies. Or 30 million copies. Or 52 million copies. Whatever it is, it’s a hell of a lot more than Dawkins.