The conclusion of evidential apologetics is that the Bible's historical accounts and other truth-claims are more probably true than false, thus the whole of scriptural revelation may be rationally accepted, and where we can't approach absolute certainty we must accept the explanations most likely to be true. The goal of presuppositional apologetics, on the other hand, is to argue that the assumptions and actions of non-Christians require them to believe certain things about God, man, and the world which they claim not to believe. This type of argument is technically called a "reductio ad absurdum" in that it attempts to reduce the opposition to holding an absurd, i.e., self-contradictory position; in this case, both believing in facts of Christian revelation (in practice) and denying them (in word). So, in essence, evidential apologetics attempts to build upon a shared acceptance of self-evident or worldview-neutral facts, while presuppositional apologetics attempts to claim all facts for the Calvinistic Christian (sic Arminian) worldview as the only framework in which they are intelligible.