Maybe this is a bit obscure, but has it ever came to your attention how many sheep metaphors there are in the bible: the Lost Sheep, the Sheep and Goats, the Good Shepherd; Christians are often referred to as 'the flock'. Now as much as it pains me to take advantage of such an easy point, sheep are dumb, lazy animals that blindly follow each other toward what is desirable to them - a place in paradise, for example - without thinking it through.
I checked this out on some biblical sites, and they don't dispute it. They even patronise atheists as being 'unable to find the flock again'. Then they go further and praise qualities such as 'lack of direction' and 'defenseless':
"Even the fowls of the air have some type of defensive mechanism. Not so with sheep!"
And on that profound thought I'll finish.