...religion is not a deep-seated or inherited tendency. It is a crutch to which people turn when they are under extreme stress, "a natural invention of human minds in response to a defective habitat". Americans, he says, suffer appalling stress and anxiety due to the lack of universal health care, the competitive economic environment, and huge income inequalities, and under these conditions belief in a supernatural creator and reliance on religious observance provides relief. By contrast, the middle class majorities of western Europe, Canada, Australia, New Zealand and Japan have secure enough lives not to seek help from a supernatural creator.
http://www.guardian.co.uk/commentisfree ... egory-paul
You can find the link to the original study at the site above (the Guardian).