What one book should an atheist recommend to a fundamentalist that will open their mind to atheism but is not focused on the debate about whether god exists?
I realize that this is an odd question since the atheism is fundamentally about the issue of not believing in a god or gods, but in any case...
I have recently met a very smart fundamentalist Christian who asked me my religious beliefs (atheist / secular humanist) and then asked me if I had read Mere Christianity by C. S. Lewis. I have, and then asked her if she had ever read any books by an atheist about religion, which she hadn't but was open to do. She studies modern, mainstream psychology, so she's not anti-science. (She's a first-year in college, BTW). Her image of atheists based on past experience is the stereotype of confrontational, self-centered (i.e. not community or charity-focused), negative, and nihilistic.
I'd like to recommend a book that can open her mind to the idea that atheists and/or an atheist life can be moral, humanist, positive, meaningful, etc. but, since this may be the one book she ever reads dealing with atheism, I don't want it to be focused on arguments about whether god exists, since there is certainly next-to-zero chance she will ever change her tune on that. I also don't want a book that details the problems or evils caused by religion. But, I'd like something more focused on religion than, say, a beautiful secular description of the wonders of science and the universe.
I certainly plan to open her up to these ideas through my own example, but I do want a book do discuss with her.
I have already read this
question and this
one, but neither seemed quite on point. This
question is probably closest, but I feel that there might be something out there better for my purposes.