I was listening to a podcast by Jim Wallace from PleaseConvinceMe.com the other day on my way to work. He was talking about atheists’ stock objection to the cosmological arguments: “Well, then, who caused God?”
Wallace pointed out that the question itself is meaningless. He illustrates his point by asking, What sound does silence make? Silence is soundless, of course, so it makes no sense to ask what kind of sound it makes. Likewise, the question, Who created God? is a meaningless question because by definition God is an eternal, uncreated being. To ask, Who caused God?, then, is to ask, Who caused the Uncreated Being to exist? which is meaningless.
For additional information on responding to the “Who made God?” objection, read my post “Inexcusable Ignorance Part II.”
Which argue that the universe needs a cause, and that cause is God.