Basically the presents the evidence that god does not exist. In the process, he connects atheism with a healthy mind and religiosity with a lack of education. He doesn't say it, but he portraits those who believe in god as stupid. Also, he seems to take religion(s) as the source of all evil - again, he doesn't say it, but it's pretty obvious. You can see that he's so pissed off that it makes it hard to accept that he really thought it through. I liked some parts of the book, others not so much. A big problem for me is also his use of the words belief and truth. And finally, it seems to me that he is religious as well - his belief in the omnipotent Science is evident.