If you have talked with an atheist before about the existence of God, undoubtedly you have heard them respond with, "But who created God?" This is usually in the context of presenting the cosmological argument, explaining that all things that have beginnings have causes, the universe had a beginning and therefore must have had a cause. Atheists strangely think by saying, "What caused God?" they have found a defeater for this cosmological argument. But as Dr. William Lane Craig explains in the following one minute video, the question the atheist is asking there is completely irrelevant, and therefore not a defeater to the cosmological argument.