Within criticism of religion, counter-apologetics is a field of thought that criticizes religious apologetics. Every religious apologist criticizes the defense of other religions, though the term counter-apologetics is frequently applied to criticism of religion in general by freethinkers and atheists. Luke Muehlhauser, the former executive director of the Machine Intelligence Research Institute, defines counter-apologetics as "a response to Christian apologetics...examining the claims and tactics of Christian apologists and then equipping [a thinker] with skeptical responses to them".