I have to say, while I respect Dr. Dawkins immensely for the work he has done to further science and weed out ignorance and pseudo-science, his aggressive anti-religious adherence is a bit off putting.
I'm not one to come out in support of religious dogma or anything, but there is indeed something inherent in the human system which seeks higher meaning in an abstract and metaphysical sense. Certainly, religious thought is not the only way to seek this metaphysical longing (I myself have constructed my own theories on the nature of reality), but it is a primary part of many people's lives. It is tied to their culture and self-identity.
When someone comes along to deliberately and aggressively shake your belief structure, it's not just shaking your belief. It can come as an assault on your culture and indeed, your identity within that culture. It is INSULTING.
I'm sure Dr. Dawkins only means to spread the practice of scientific inquisitive thought to replace superstitious thinking, but critical thinking can and does exist within the confines of spiritual life.
I'm not a religious man myself, nor would I call myself particularly spiritual, but I respect a person's background and, while I may call things into question about their thoughts on observable phenomena, I leave matters of faith alone. I personally cannot find reason enough to believe in the sanctity of any particular dogma, but I cannot tell another person that their long held belief is totally wrong when I have NO REAL SUBSTITUTE. Physics and Metaphysics are pretty different.
The best that you can do is inspire true critical thought in people and lead them to come up with their own questions about their particular faith. If a person cannot bring themselves to question their faith THEMSELVES, then they merely have not yet gained that basic scientific epistemology that we can truly KNOW nothing. Perhaps that is the divide that most separates the devout from the secular.
The tenants of science are indeed important and ever-present in human logic and should be spread far and wide, but only in conjunction with a healthy respect for culture and context.
