I know this can be a touchy subject for people, so apologies in advance if I offend anyone.
Liquidwave-
I haven't read the God Delusion, but regardless of whether it is a good read, a biologist just doesn't have the credentials to write a proper book on a philosophical topic. I guess anyone who thinks philosophical thoughts might think himself a philosopher, when that is not necessarily the case. Would you go to an economist to learn about steam engines? If you like this book, I highly recommend David Hume's
Concerning Natural Religion. It may have been written a few hundred years ago, but it's surprisingly accessible and relevant. Hume was a great writer, so don't think that you'll be reading boring academic stuff.
pwt-
Ehh, I don't know. I was just hoping I could throw that out there, like one would say "astronomers say X," where X is something that is beyond someone's individual reach of verifying but we can believe it as true because scientists say it. Maybe that doesn't work so well for philosophical topics, heh.
As for the actual topic of dualism, I have to clarify a few things so that you know what it is I am arguing against. The kind of dualism Dawkins is likely speaking out against is the kind where the mind and the material are distinct, where space, time, and motion is only applicable to the material and thinking is only applicable to the mind. I'm guessing he's also against the possible implications that soul/spirit might have. Historically, spirit/soul and mind have been used interchangeably. However, spirit has some religious connotations, from immortality to some really weird shit, like invisible people with wings and forked tongues.
Again, I haven't read the book, so I might be wrong here.
So here are the problems that I can't get past with dualism:
A) If the mind and the material are distinct, how does the mind affect matter? Or does matter affect mind? Descartes said that it was through the brain (specifically, the pineal gland, but that is unimportant) that mind and matter interacted, and that mind affected matter perhaps similar to how gravity affects objects. But the brain is still material, and the mind is still immaterial. He's only changed the scale of the problem from material in general to a specific material. How can it be that something spatial is relating to something thinking?
B) Wittgenstein said that even when we are thinking our innermost, most spiritual thoughts, we must use language, language that is inextricably tied to body and to culture. Language here doesn't have to mean full, complete sentences and commonly used words. It's the way our minds form distinctions, relations, and conceptions. And so, our spiritual thoughts are tied to the material world.
C) Poke your eyes out, no more vision. Stab your eardrums, no more hearing. Damage your brain a certain way, no more short-term memory. Damage it another way, and you lose linguistic capabilities. And so forth. If you cut out all the physical processes that create your conscious experience, what's left? What reason do you have to believe that you are not your body?
Of course, rejecting this kind of dualism doesn't help to explain the wonder of our consciousness. How is it that we are conscious beings? To quote Jeff Mangum, "Can't believe how strange it is to be anything at all!"
Personally, I stop at the wonder and leave the explanations up to people smarter than me, the neuroscientists, philosophers, cognitive scientists, etc. If you like this sort of topic, though,
philosophy of mind might be for you.