Religion’s Dirty Dozen—12 Really Bad Religious Ideas That Have Made the World Worse

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12. Really?! Only a dozen?

One of the worst I can think of that doesn't appear here is mind / body dualism.
That's the basis of the "we're not of this earth, we're really angels in mortal flesh" sort of thinking.
The whole homunculus argument. It separates us from our environment and tells us we have "dominion" over this earth.

I just read Nicholas Carr's "The Glass Cage: Automation and Us",

“the mind is not sealed in the skull but extends throughout the body. We think not only with our brain but also with our eyes and ears, nose and mouth, limbs and torso. And when we use tools to extend our grasp, we think with them as well. “Thinking, or knowledge-getting, is far from being the armchair thing it is often supposed to be,” wrote the American philosopher and social reformer John Dewey in 1916. “Hands and feet, apparatus and appliances of all kinds are as much a part of it as changes in the brain.” To act is to think, and to think is to act.”

http://www.goodreads.com/work/quotes/33482231-the-glass-cage-automation-and-us