-The noted Christian apologist, G.K. Chesterton is often credited as saying ““When men choose not to believe in God, they do not thereafter believe in nothing. They then become capable of believing in anything.”

Actually, there is debate about whether or not Chesterton actually said that. Emile Cammaerts, in his book The Laughing Prophets (1937, Page 211) quotes a different phrase coined by Chesterton, and then offers his own logical conclusion of Chesterton’s words. The quote of Chesterton (taken by Cammaerts from The Oracle of the Dog, 1925) actually says, “It’s the first effect of not believing in God that you lose your common sense.”

Cammaerts then adds his own words, “The first effect of not believing in God is to believe in anything”

http://bobsiegel.net/wp/2013/03/22/when-people-stop-believing-in-god-theyll-start-believing-in-anything-2/