The success of science sometimes leads people to think that because we can understand the mechanisms of the universe, then we can safely conclude that there was no God who designed and created the universe in the first place. This reasoning commits a logical error in that it confuses mechanism and agency. Consider a Ford motor car. It is conceivable that someone who was seeing one for the first time and who knew no science might imagine that there is a god (Mr. Ford) inside the engine, making it go. Of course, if he were subsequently to study engineering and take apart the engine, he would discover that there is no Mr. Ford inside it. He would also see that he did not need to introduce Mr. Ford as an explanation for its working; his grasp of the impersonal principles of internal combustion would be enough to do that. However, if he then decided that his understanding of the principles of how the engine worked made it impossible to believe in the existence of a Mr. Ford who designed the engine in the first place, this would be patently false. Had there never been a Mr. Ford to design the mechanisms, none would exist for him to understand. It is equally mistaken to suppose that our scientific understanding of the impersonal principles according to which the universe works makes it either unnecessary or impossible to believe in the existence of a personal Creator who designed, made, and upholds it. — John Lennox (from, Beyond Opinion: Living the Faith We Defend)