"... in the nineteenth century people said we should stop believing in the sacred, and then we won't do terrible things any more. Then we had two very atheist dictators, called Stalin and Hitler, who between them killed even more people than anyone had killed in the name of the sacred."
with everything else that can be dumped on stalin, this is at least partly right in calling him an atheist...but hitler professed faith in god, in fact, claimed to be doing "his" work in cleansing the world of commies, democrats and jews...not necessarily in that order, and not a direct quote, but closer to truth than calling him an atheist...
as for the death tolls, let's leave that anti-historic pathology alone for the moment...
fs