Evidentialism v. Presuppositionalism

I have noticed a worrying trend among some Christians. It is the turn away from evidentialist apologetics toward presuppositionalist apologetics.  

Evidentialism holds that belief should rest on evidence. 

Presuppositionalism holds that belief rests on presuppositions. 

Evidentialist apologetics attempts to bring converts by revealing the evidence behind Christianity. Evidentialists say that scientific evidence actually supports Young Earth Creationism, that archeology has proven the truth of the Bible, both new testament and old, and that the evidence for Christ's historic existence is overwhelming.

Presuppositionalist apologetics attempts to bring coverts by arguing that the only rational, coherent worldview is that which begins by presupposing the divinity of the Bible, the existence of God, and the reality of Christ's sacrifice. In other words, presuppositionalists say that one must presuppose Christianity, and that trying to convince someone based on evidence is flawed. 

Evidentialist apologetics is traditionally associated with evangelicalism and fundamentalism while presuppositionalist apologetics is associated with more reformed traditions. This actually makes a lot of sense given that arminianism emphasizes free will while calvinism emphasizes predestination. It also makes sense given that Cornelius Van Til and Francis Schaeffer, both reformed, are the major luminaries who developed presuppositionalist apologetics. More and more these days this approach is spreading beyond reformed circles and into evangelicalism and fundamentalism in general. 

I was raised on evidentialist apologetics (not surprising given that my parents were strong arminians). My parents were fond of telling the story of Josh McDowell, who started out as an atheist attempting to disprove the truth of Christianity and ended up concluding, based on evidence, that Christianity was actually true. I was taught to follow the evidence, and assured that evidence led directly to Christ. 

Having been raised on evidentialist apologetics, when I arrived at college and found new evidence I had never heard of as a child, I didn't simply reject that evidence. Instead, I researched and read and studied and reevaluated my beliefs based on new evidence. I found, for example, that the evidence does not actually indicate that Young Earth Creationism took place (quite the opposite), that archeology has actually contradicted the Bible in many places, and that the Bible actually does contain historical errors and contradictions. This process of reevaluation started a long spiritual journey, and even today I continue to strive to follow evidence, and I work to make sure I take into account any new evidence I encounter. 

The goal of evidentialist apologetics is to convince others of the truth of Christianity by using evidence. It assumes that anyone who honestly looks at the facts will arrive at the truth of Christianity, and that the facts support the truth of Christianity. In the last few years, my parents have been moving toward presuppositionalism. This makes sense, given that the evidentialist approach actually led me away from their beliefs and that Vision Forum is actually openly and proudly presuppositionalist.

Presuppositionalism argues that the evidence we experience in the world is simply facts and pieces of data that must be interpreted through an interpretive framework, or worldview, and that the only way to consistently interpret these facts is through the Christian worldview. In other words, a person looking at facts and evidence will not necessarily be led to Christ; rather, one must start by assuming the truth of the Bible in order to find Christ. You can see the influence of calvinism here. Presuppositionalist apologetics, then, focuses on pointing out inconsistencies of other worldviews and arguing that Christianity is the only coherent worldview, the only way to explain the existence of reason and logic. In fact, presuppositionalism literally goes so far as to argue that evidence-based apologetics - as opposed to apologetics based on contrasting worldviews - is contra-Biblical. 

Presuppositionalists don't deal with evidence, because they argue that evidence and facts are neutral and can be used to support any worldview, because they are interpreted through that worldview's lens. In other words, if someone presupposes a world without God, that's what they'll see; if someone presupposes a Christian world, that's what they'll see; if someone presupposes a Muslim world, that's what they'll see; etc. That is why presuppositionalists spend their time not on the evidence but rather on trying to show that their worldview is only rational, coherent worldview in existence, and that every other worldview is internally contradictory. Evidence doesn't matter; what one chooses to believe is what matters. 

The problem with these people is that you can't argue with them. They're going to believe it because they believe it, and nothing else matters. As an example, Answers in Genesis, a Young Earth Creationist group that runs the Creationist Museum in Kentucky and has recently embraced presuppositional apologetics wholeheartedly, is actually completely open about the fact that it simply rejects evidence that contradicts their interpretation of the Biblical account of creation. It's not about the evidence. It's about the presupposition. And no matter what you say, you're not going to change their minds. 

Problems with presuppositionalism include: 

• The logic is circular: you prove something is true by assuming it is true.
• Presuppositionalism could be used to "prove" any religion, or even atheism. 
• Just because a worldview is coherent doesn't mean it's true. 
• There are many things about the Christian worldview that are arguably not coherent. 
• There are other worldviews that also explain the existence of reason and logic. 
• You can't actually know something is true if you simply discount evidence entirely.
• Finding truth involves not making presuppositions, but trying to rid yourself of them.  

Presuppositionalism holds that everyone starts out with assumptions, and that starting by assuming the Bible is therefore no different than what anyone else is doing. Actually, most people start out with fairly simply assumptions. I, as an example, start out by assuming that I can trust my senses and that the world around me is something I can seek to understand. Lest a presuppositionalist argue that these are atheist or materialist assumptions, I would point out that essentially everyone starts out with these assumptions. In fact, I have never met a Christian who didn't start out with these same assumptions. Assuming that we can trust our senses and learn about the world around us is completely different from assuming the truth and divinity of the Bible or the existence of God. 

I have a friend who is a presuppositionalist. I recently asked her what she would do if archaeology directly contradicted a literal reading the Old Testament (it does). She told me that it would not change anything, because she would simply assume that future archaeological finds would clear up the contradiction and line up with the Old Testament. In other words, actual evidence in the here and now does not matter, not one whit. All that matters is her assumption that the Bible is true. 

But I have to ask: If you simply assume your beliefs are true and throw out any use of evidence at all, if there is no possible evidence or experience that could disprove your beliefs, how in the world can you actually know they're true? It would be like me saying that there is an invisible pink unicorn that lives in my room. You can't touch it or hear it or detect it with any sort of test. You're not ever going to come to the unicorn's existence through evidence, and you shouldn't try to. Rather, you simply have to assume it's there. But then, if there is no evidence for it and it can't be disproven, how in the world do I know it's there in the first place? I don't: I just assume it. Wha?

Interestingly, this emphasis on maintaining a persuppositional worldview is is why Vision Forum and others like it see secular colleges and secular sources of knowledge as dangerous. For them, facts and evidence are not neutral, but are interpreted through an assumed worldview. Therefore, a Christian should never study under a non-Christian, because what he will be learning falsehoods, not truth. One can only learn truth by studying under other likeminded Christians. The insularity this produces is overwhelming.