The comparison is between zombies and the natural processes throughout the universe. There's no one at home in either, as far as anyone can tell. Mystics may feel otherwise, but they're the first to say their peak states of consciousness are ineffable.

Intelligent creatures evolved largely by the "living-dead" process of natural selection. I have an upcoming article where I argue against the eliminativist Scott Bakker, where I say there is indeed someone home in each person. (And I argued the same several years ago on my blog and when I guest-wrote for his blog.)

The folk psychological conception of the self (as a conscious, free, rational mind with beliefs and desires) won't likely be explained away by cognitive science. Once a person develops, the person's actions are often artificial (intelligently designed and chosen) and unnatural rather than zombie-like and mindless. (Mind you, our behaviour can be automated and degraded, too, depending on the cultural factors and so forth.)