<human>:  Why does Bush think that the existence of God is a delusion?
<bot>: Well, he thinks that the existence of God is not provable. You can’t prove or disprove the existence of God. You can only show that there is no evidence for God’s existence. I’m sure he would say that God is a delusion because he thinks that God is a belief that humans have made up to explain things in the world that we don’t understand.