I don't see how that has anything to do with religion. Having multiple opposing powers is happens without religion, and having a single powerful authority happens with religion.
Religion is a social pattern and it connects to other social patterns too.
Also I think it is important to scope that "atheism" is usually a shorthand for "Western, Secular Humanistic Atheism" which is philosophically an off-shoot of Protestantism in general and Calvinism in particular. You get a different set of results when you look at Buddhist Atheists or Hindu Atheists for example (because in neither of these traditions is religion dependent on belief like it is in Christianity).
