Atheists have rational thought on their side. I don't see a purple elephant standing in my back yard; therefore, I will assert that there is no purple elephant back there.
Religious zealots are irrational. They see a purple elephant in the back yard because they want to see one, even though there is no purple elephant in the back yard. And then they go around the neighborhood, and the town, and the state, and the world, TELLING EVERYBODY: "Listen, there is a purple elephant in my back yard! And you've probably got one in your back yard too! I can't see him--and you won't either--but I know he's there and if I give you this book full of 2nd grade stories, you will believe in the purple elephant too. And it's important to remember that the purple elephant loves you. And if you get run over by a truck tomorrow, or kidnapped and killed, well, it's because that's the will of the purple elephant. But don't worry, if that happens, we will all say prayers for you....to the purple elephant. And if you believe all this, then after you die, you'll go to a wonderful place in the clouds and eat TV dinners for eternity--and no one will care! Oh, it's heaven. DO believe in the purple elephant, sir!"
Religious folks are humorous.