The quietness of the sheep

‘How can you call your congregation a flock? Doesn’t that say everything about your religion?  That you think they’re sheep?’ – Richard Dawkins

I find it strange that Mr. Dawkins, an evolutionary biologist, has never (as far as I know) spoken about the built in self defense mechanism found in every flock of sheep. You’d think this would be right up his alley. This inherent ability seems to make sheep way more formidable than one might originally anticipate.