I used to be on a message board (EvolutionVsCreation was an MSN message board) that was predominately atheist/agnostic, so I'm used to some of their arguments. Basically I think what Dawkins viewpoint is, is called strong atheism. Other atheists are called weak atheists.
A weak atheist might say that he or she doesn't see any evidence for God, so has no reason to believe in God. However, a weak atheist would theoretically be willing to believe in God if there were demonstrable evidence that would satisfy them. They believe religious people are wrong, of course.
A strong atheist would say that not only is there no evidence for God, but the evidence points exclusively to their being no God whatsoever. A strong atheist is certain in his or her conviction that there is no God, and therefore see people who are religious as not only wrong, but suffering from a warped worldview or even a sickness of the mind.
It's a fine distinction, but it's important to know which is which when you are dealing with them, because it makes a difference in how you approach them and debate with them.