Atheists should not be so quick to snicker, however, as I believe disallutionation are the very nature of being human. Every single religion reveals a disallusion in how they feel connected to the universe, how they believe that they are able to be pure and noble, that they have a purpose, that if they are virtuous they will live forever, and that life has a meaning. Even atheists, I believe, must choose their own fantasy to live on whether it is that technological achievements can bring about global prosperity, that humans are noble, gentle creatures, or that they can make a difference in the world by will alone.
We do the same thing all the time in smaller ways when we root for the underdog, when we walk into a casino, and when we believe in ourselves, and often when we decide to go to school. When we take on political tasks, such as joining the military, voting in an election, writing our congressmen, or discussing politics. We believe in a reality that doesn't quite fit into an entirely material world. And is thus, unprovable.
As an athiest, I did not suddenly decide not to believe in God by reason alone. It just kind of happened one day when I questioned pure evil.
(sorry for my spelling and grammatical problems)