A Different Perspective

I was invited to participate in another book club. The coordinators are the local atheist/humanist group. I figured it would be interesting and I'm always up for learning things from a different perspective.
Their first selection was a nonfiction piece by Christopher Hitchens, an "antitheist", titled God is Not Great: How Religion Poisons Everything. This is my first piece of overtly anti-religious literature I've read. However, a lot of the "evidence" used in it touches on other literature I studied during college, especially during my "Science and Literature" course. I read a lot of different text on the concepts and theories of evolution and the "missing link". However, I have not continued to follow the science.
It will be an interesting night and a discussion that I hope I can participate in without getting flustered. I have a tendency to lose my train of thought when people are obviously not following my train of thought. I never claimed to be brilliant, so hopefully they'll forgive the "average" intelligence brain I'll be bringing.