Atheists just don't care about God.
If someone wants to believe in God that is their problem not mine. It boils down to responsibility for actions. Blü seems to be right that do what you are told to do is the default human condition. It doesn't matter much who or what tells you what to do. When you do it it is their fault not yours if it turns out badly. Even the vuvuzelas favorite dodge when they are caught with their dresses up is that "It was God's will." In other words it is not my fault.
That is why theists want God to exist.
Atheists, once they become adult realize that it is their fault. Life is finite and what they do with it is their responsibility.
"Live a life worth dying for." Forrest Church
Or the thought attributed to Cherokee traditions:
"When you were born, you cried and the world rejoiced, Live your life so that when you die, the world cries and you rejoice."
There is no one to blame if you don't live your life, and if the world doesn't cry the failure is yours. It is not necessarily a comfortable way to live, but at least you live. As El Cid says on another thread if you believe in God you are dead when you are born, a puppet while you are alive, and thrown away when you die. Maybe the dumpster will be comfortable or maybe not. You will never find out.