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“When a man stops believing in God,” G. K. Chesterton is often quoted as saying, “he doesn’t then believe in nothing, he believes anything.”
Chesterton almost certainly didn’t say quite that, although the statement is certainly Chestertonian in its general import. In any event, the sentiment may also be relevant to this:
http://www.nationalreview.com/article/440812/social-science-religion-compared