By Dr. Greg Bahnsen in Penpoint VII:2 (Feb./Mar., 1996)
Presuppositional apologetics as taught by Cornelius Van Til urges the Christian to argue with unbelievers in an “indirect” fashion, doing an internal analysis of the unbeliever’s worldview (his fundamental assumptions about reality, knowledge, and ethics) and comparing it to the worldview revealed in the Bible.
Many students of apologetics have come to see the strength of this apologetical challenge when it is applied to the various kinds of views advocated by atheists or materialists.
Given the presuppositions of the atheist, he could not make sense out of adherence to the laws of logic (as I tried to show in my public debate with Gordon Stein), nor could he make sense out of the principles and procedures of science itself (as I tried to show in my public debate with Edward Tabash). The atheist cannot give a rational account of the fundamental assumptions of ethics, either…