One thing I've noticed while working at a busy Midwestern airport bookstore is that a huge amount of books - fiction and nonfiction - deals with or mentions religion in some way. It's a huge part of the human experience whether you're in it, outside of it, or dallying right down that fine line (where I am right about now). The religion/spiritual section in each of the 6 stores is rather small, monotonous, and unpopular; the only religious text available is the Bible, of course (one store has two versions). Then there are a ton of Karen Armstrongs, Deepak Chopras, Chodrons, that super-popular pastor guy with the huge teeth, C.S. Lewis, the Dalai Lama, etc. Two of the biggest and most popular stores also carry Dawkins, A.J. Jacobs, and Hitchens. And, of course, The Shack is everywhere - I have yet to read this.
I'm still trying to figure out how to tie in my personal beliefs (ambiguity defines them best, not agnosticism) to the rest of life, that is my main issue right now. Although I'm a long way from forgiving all the teachers, administrators, clergy and laypeople who used religion-spirituality to chisel away at me, I'm making peace with religion in general...trust is still a big issue.
I've read "God is Not Great" by Christopher Hitchens and C.S. Lewis' Christian non-fiction. I don't see any difference between declaring that God doesn't exist because of church corruption and declaring that God exists because the North Star exists - both miss the point entirely! Figuring out how to relate my spirituality to the rest of life is such a delicate process because I don't want to slip into either of these habits.
In short: there is nothing inherently wrong or harmful about believing in something or not. What really matters is how it affects the rest of your life.