Time for someone to play the Devil's Advocate, and I have the perfect forum name...
First off - agreed about the rudeness factor; generally there's no excuse for that. I agree with Kiless that Professor Dawkins can occasionally come off as abrupt or rude; I believe generally this is not malicious (I noticed it at TAM3 when getting my books signed; he wasn't exactly chatty like say Phil Plait or Michael Shermer were).
But back to the "can you be a skeptic and still be a believer?" I'd like to bring up something that the late Douglas Adams pointed out - for some reason, in our society, we cordone off certain subjects. If you tell me that South Africa is a better cricket team than Australia, I'll think you're wrong but we can have a civil discussion regarding the merits of each side. However, if you tell me you need to start working at 4am and leave at 3pm for the next 2 weeks because of something an arguably mythical figure supposedly told you to do a couple of millenia ago, I'm supposed to simply accept that.
Why is this?
I do not respect people's religious beliefs - tolerate, sure, but I respect them no less than I respect people's opinions regarding whether the world is round or flat, or whether we actually landed on the Moon or not. There is no more evidence for religious beliefs than the most whacked out New Age woo-woo nonsense.
Thought experiment: let us suppose that a speaker was proposing to say at TAM how the fact that he believed in alien abductions/ghosts/Bigfoot/pick-your-favourite-nonsense was in no way in contradiction to the assertion that he was skeptical: would this be OK? If not, and yet belief in a deity is OK, what's the difference?
From one perspective, all religious people are skeptics. Christians, for example, are skeptical of the existence of Buddha, Zeus, Odin, Shiva, Brahma, and so on - even fundamentalist Christians fit this mold. But if you cast the net that wide, you're going to find a hard time defining something that isn't skeptical.