Let's put the facts right: I am an antitheist. I consider somehow important to state that at the beginning of my review. The reason behind it, to put it simple, is that if everybody would let his/her belief dictate his/her actions, the world would be even a worse place. Alright, most people are like that anyway. Although, still, it's silly to follow any belief when humans -generally- can use common sense, and can acquire a great deal of knowledge if desired. I suppose belief and knowledge are contradictory terms. I'll try to simplify further: If it's OK to belief in god, it's also OK for me to belief that, instead of a brain, you have a worm in your head sitting at the controls. Or that anybody but me deserves the worst. For example. For A LOT of people, these beliefs are actual realities, no matter how absurd. Also, a faith is not needed for doing good deeds.
As for the movie itself, there's not much to say about it, since it's self-explanatory. I wish Dawkins would have taken more time to explain why no form of belief whatsoever is appropriate, since there're many people who think that it's OK to worship as long as it's "harmless".
I'd also like to say that science is, in many instances, as dangerous as religion. Let's not forget that many scientists BELIEVE that certain theories are actual truths, and that the creation of weapons, vivisection, environmental destruction and other forms of abhorrent acts are thought of or directly perpetrated by so-called scientists. Science always sold itself for the right price, and will also have an absurd excuse to justify the damage it causes. This is another point shared with religion.
And so, even though it's outrageous to be wasting physical and brain resources (if it can be called that) believing that there're imaginary beings with divine powers floating around when that time could be used for learning practical knowledge to help save the Earth from human destruction, let's keep in mind that people of science are actually part of the problem too.
Alas, the best one can do is get away from any religious or scientific dogma and simply live by taking common sense and reason as a guide for your actions.