Religion
There are several types of religions on this planet. Each as crazy as the next. People believe in all different kinds of higher powers or Gods. Why is YOURS the right one? Christianity for example is ruining the united states. The Bible is in essence of a book of magic and miracles. In the stories of the Bible, God talked to people, and miracles happened, why doesnt that happen anymore today? Because it never happened, and the Bible was written by man. One last thing...consider this, there are a growing number of people who believe that we descend from alien life(me not being one of them), and you may laugh at that theory. But there is a mountain of evidence(even evidence documented by the U.S. government, yes it's true. Don't believe me? Well it's certainly out there) pointing to the existance of extra-terestrial life compared to the NO evidence of the existance of God. That is all.
The opium of the masses.