Thus, the apologetic task will consist, not of externally verifying the Christian presupposition but, of applying it by (1) bringing God’s truth and commands to bear upon the lives of unbelievers, appealing to the image of God in them (distinguishing between present remnants of man’s original nature and the ever-present nature of fallen man), pointing out that every fact of the world bears witness to God, and (2) doing an internal critique of the non-Christian’s system, calling down its idols, and pointing out the absolute necessity of Christian presuppositions if logic, factuality, history, science, and morality are to have any meaning, validity, and application at all. The Christian apologetic will not concede intellectual ground to Christianity’s cultured despisers or allow them to exploit theoretical foundations to which they have no legitimate claim without depending on the Christian faith. Thus, part of the Christian’s reasoned defense of the faith will be an aggressive offense.
Bahnsen, Greg (2009-03-01). Presuppositional Apologetics: Stated & Defended (Kindle Locations 433-442). American Vision. Kindle Edition.