What's a Presupposition?
noun: presupposition; plural noun: presuppositions
a thing tacitly assumed beforehand, or taken for granted, at the beginning of a line of argument.
synonyms: presumption, assumption, preconception, supposition, first-principle, premise, postulation
Why Should I Care?
Everyone has presuppositions -- ideas or assumptions they take for granted. They may be true or they may be false, but everyone has them. Often we assume that others share our presuppositions, but frequently they don't. Being able to recognize one's own hidden assumptions and those of other people can be very helpful in understanding why people come to differing conclusions and can help prevent us from committing logical fallacies or errors in our thinking.
Analysing the most basic first-principles of any worldview, faith, or religion is one of the fastest ways to discern if that worldview is true or false. Sometimes, when the presuppositions are actually considered, the errors in the view are blatant and undeniable.
How Does This Work?
Presuppositional apologetics involves a very simple procedure or method. Any specific application of the method may be difficult or get complicated, but the method itself is very simple. It involves two steps, one offensive and the other defensive.
- Offense: Internally analyse the non-Christian's worldview and show how it is contradictory.
- Defense: Internally analyse the Christian worldview and show how it is consistent.
Notice that each worldview must be internally analysed. A worldview can't be analysed from the outside. To analyse it from the outside is to assume things that it doesn't assume. This leads to what is known as "straw-men fallacies", where the worldview is mischaracterized while it is being investigated.
Nobody wants that.
Many people want to look at evidence before accepting a worldview. But evidence is always understood based upon one's worldview, not the other way around. If we interpret evidence according to our own view in order to investigate someone else's view, we'll never actually see their view for what it is.
A full presuppositional apologetic involves both offensive and defensive steps, but sometimes only one or the other step is needed. Generally, in a one-on-one conversation with a non-Christian, employing both steps is very important. But good offensive and defensive arguments can also stand alone.
Examples: On the Offense
Each of these examples are just intended to be one piece of a conversation with a non-Christian, to assist the Christian in pointing out problems with the non-Christian's perspective. None of these particular examples are proofs of Christianity -- they just argue against forms of non-Christianity.
Deductive Argument that Atheism is False
Atheists presuppose two things that are in fact mutually exclusive: they cannot both
be true. The first is that their own conclusions are rationally justified, and the
second is that there is no sovereign rational creator. The combination of these two
presuppositions makes the worldview of the atheist inherently contradictory.
Deductive Argument that Polytheism is False
Polytheists also presuppose two things that are mutually exclusive. The first is
that non-contradiction is both universal and invariant, and the second is that there
are multiple sovereign creators. But as Socrates pointed out in Plato's Euthyphro,
the combination of these two presuppositions makes the worldview of the polytheist
Deductive Argument that Deism is False
Deists likewise presuppose two things that are mutually exclusive. The first is that
their own conclusions about the present are rationally justified, and the second is
that no sovereign rational entity has authority over time. These two views, however,
cannot both be true.
Deductive Argument that Unitarianism is False
Unitarians, too, presuppose two things that are mutually exclusive. The first is that
their version of god is rational. The second is that his ultimate reason for his actions
is not himself. As the proof demonstrates, this makes unitarianism incoherent.
In Printed Form
Along with numerous other authors including Don Landis, Bodie Hodge and Roger Patterson, Timothy McCabe contributes analyses of various world religions and cults in this volume from Master Books.
Who is Timothy McCabe?
Born in Virginia in 1974, Timothy McCabe grew up overseas, the son of a diplomat. Influenced by the cultural diversity he experienced in the Philippines, England, India, Japan, and a variety of other nations, much in life seemed very culturally subjective to him. After high school, McCabe began to slowly walk away from the values he had been raised with. Eventually, this led to emotional distress, broken relationships, failed dreams, and public humiliation.
Then Jesus saved him.
From that time on, amid a world laden with cultural subjectivity, Tim has trusted that Jesus Christ will provide for him; that God's revelation in the Bible, while often apparently open to interpretation, cannot possibly be false; and that some truths are not based on human opinions. The facts of God's existence, man's sin, the problem this creates, the solution through the sacrifice of Jesus Christ... these objective truths transcend every culture.
Tim now resides in Indiana with his wife and daughter. In his spare time, he writes novels that have never been published and contributes to the God Contention website, which he also designed and developed.
Virginia Polytechnic Institute and State University
American School in Japan
"Why do seemingly logical individuals arrive at such differing conclusions regarding existence, all the while maintaining that logic allows nothing else? Is the same information being evaluated? Is the same definition of logic being considered? "
Romans 1:18-20 (NASB): For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men who suppress the truth in unrighteousness, because that which is known about God is evident within them; for God made it evident to them. For since the creation of the world His invisible attributes, His eternal power and divine nature, have been clearly seen, being understood through what has been made, so that they are without excuse.
"You say god cannot lie? He said that Adam and Eve would die if they ate from the 'Tree'.. yet they did not die. He said nothing about sin, he said that they would die."
Genesis 2:16-17 (NASB) The LORD God commanded the man, saying, "From any tree of the garden you may eat freely; but from the tree of the knowledge of good and evil you shall not eat, for in the day that you eat from it you will surely die." At first glance, it is difficult to see how this was true, according to the Genesis narrative. After all, the day that Adam and Eve ate from the forbidden tree, they didn't fall down dead.