God is Not Great by Christopher Hitchens
In sum, Mr. (or Professor?) Hitchens thinks that religion is, and always has been, bad for humanity. He is not speaking as a former religionist, which assists in the tone, but is looking at the outcome of belief in God as the consummate outsider. As that, not only does he see it as silly, but more often dangerous than not.
Of course, he has a lot of fodder to his case. The far majority of people in the history of humanity have been religious, and there have been a lot of people using religion as their excuse to do awful things. People have killed, abused children, committed genocide, tortured and done any number of other things in the name of one god or another. His book, if anything, is too short. Probably an indication that he isn't really trying.
However, I don't think he really made the case that it is specifically religion that is the problem and not humanity at large. The very atrocities that he points out have also been done, in equal proportions, by secularists. This, by itself, isn't a recommendation to religion, but neither it is a drawback.
I think that he could make the case, from his evidence, that most religionists are hypocrites. Not only is that so well known as to be trite, it unfortunately can be leveled at secularists as well. In the end, most humans don't know what it is that they believe (or don't believe) and they just do what comes naturally to them. That either means that God created us a certain way or that God DIDN'T create us a certain way.
In the end, the discussion is interesting, but as an argument, it doesn't do much for either side. Good to know a particular opinion in opposition to my own, though.