A joke that makes a good point on atheism

An elementary school teacher explained to her class of young children that she was an “atheist.” She asked her class if they were atheists too. Not really knowing what “atheism” was but wanting to be like their teacher, their hands went flying into the air. There was, however, one exception. A girl named Lucy had not gone along with the crowd. The teacher asked her why she decided to be different. Lucy said, “Because I’m not an atheist.” The teacher then asked, “What are you?” Lucy said, “I’m a Christian.” She asked Lucy why she was a Christian. “Well, I was brought up knowing and loving Jesus. My mom is a Christian, and my dad is a Christian, so I am a Christian.” The teacher angrily said, “That’s no reason! What if your mom was a moron, and your dad was a moron? What would you be then?” Lucy paused, thought about it and said, “Then, I’d be an atheist.”