There is a Wikipedia page, mainly written by members of the Nontheist Friends discussion group, which contains the following definition, which may be helpful to those confused by the concept of religious atheists.
"A nontheist Friend, or an atheist Quaker, is someone who affiliates with, identifies with, engages in and/or affirms Quaker practices and processes, but who does not accept a belief in a theistic understanding of God, a Supreme Being, the divine, the soul or the supernatural. Like traditional Friends, nontheist Friends are actively
interested in realizing centered peace, simplicity, integrity, community, equality, love, and social justice in the Society of Friends and beyond." (http://en.wikipedia.org/wiki/Nontheist_Friend)