There Is No God – Atheists In America by David Williamson and George Yancey (Rowman & Littlefield, 2013) is one of the better presentations of what atheists think, believe and want.
I spent some time as an atheist in the 1960s and early 70s and have talked with scores of atheists in the years since. What Williamson and Yancey have presented from their research has a strong ring of truth about what atheists think, believe and want concerning religion and an expanding secular society, especially as it relates to government, politics and education.
One of the unique aspects of There Is No God is the inclusion of many quotes from atheists about important issues of our day: same-sex marriage, abortion, separation of church and state, and public school curricula, to name several. Reading what atheists think on these subjects in their own words should be helpful to anyone who wants to understand atheists and reach them for Christ.