Philip,
The problem I find with presuppositionalism is that it can't speak to the layman, only to the philosopher. Any apologetic that cannot be understood equally by a layman and an academic is useless.
Both classical and presuppositional apologetics can be either simple or complex. Have you seen William Lane Craig's new book on the theistic proofs? It's extremely in-depth. Mistaken, in my opinion, but in-depth nonetheless.
Also, regarding your revised syllogism, when you say, "If any part of the whole is true, then the whole is true," are you referring to the "vital" parts of Christianity, the parts that no other worldview would have, e.g. the resurrection? If so, I would agree, but I would have two observations: (1) it is no different from the typical evidential apologetic, and (2) it doesn't result in a necessary truth (unless this vital aspect can be proven with certainty).
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CT,
But is not Paul's claim in Romans 1, one which should be construed as to apply to all people and their worldviews, Christian and non Christian?
I can have an excuse for not accepting your position even if I cannot rebut it as of right now or even ten years from now.
If the unbeliever wants to just "hold out" for a future presupposition, then he must affirm an autonomous presupposition (one which makes such holding out intelligible). If the apologist is a good presuppositionalist, he will demonstrate that the unbeliever has no choice but to attempt to hold out while using a Christian presupposition to do so -- in which case he's not holding out at all.
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Clark,
Once we have shown that the Christian theistic worldview does actually account for intelligibility, is not saying, "Any worldview that is not the Christian theistic worldview will fail to account for intelligibility" the functional equivalent of saying, "Only the Christian theistic worldview accounts for intelligibility"?
Those are equivalent, and I would reject both, because they both make claims about worldviews that the unbeliever is not obliged to offer in his own defense (the apologist would have to offer them), in which case the apologist's claim becomes either trivial or impossible to prove.
And if so, isn't "Only the Christian theistic worldview accounts for intelligibility" the same as "Christian theism is necessary." -- that is, if we grant that intelligibility is possible. And if it's not, why are we having this conversation?
Both of those make implicit claims about worldviews that the unbeliever is not obliged to offer as well. When the apologist makes a claim, he has to ensure that he makes claims only about those worldviews that the unbeliever has to himself provide and put to the test.
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Allan,
Can you please demonstrate exactly why/how classical apologetics (CA hereafter) starts with "autonomy" ("self-law", or 'law-unto-oneself"), as presuppostionalism so often asserts?
Autonomy is the idea that oneself has the prerogative to interpret reality, to self-consciously construct a philosophy about the world. This is contrary to the belief that Jehovah has the prerogative, in which case we would submit to the Bible on its own authority. CA presumes that natural men are essentially right in their philosophy of the world and just need to add a few facts -- or at least they argue as if that is the case -- whereas PA presumes that natural men are completely wrong (in principle) in their entire worldview and need to drop their autonomous presupposition.
As one who takes the CA position, I fail to understand how CA acknowledging the truth of scripture(the "theonomic" starting point) in Romans 1 is "autonomy". If CA gets its view from scripture ("theonomy"), how is this "autonomy"?
If you're implying that the cosmological argument or some other theistic proof is taught as valid in Romans 1, then I would strongly disagree with that. (If you're talking about something else, please say so.)
May I ask from what sources you get your understanding of CA?
My first exposure to apologetics in general was Norm Geisler's and Frank Turek's
I Don't Have Enough Faith to Be an Atheist, which was thoroughly CA/evidentialist. I also used to be a big fan of William Lane Craig's apologetic and read his arguments. And I have read through a good amount of Josh McDowell's
The New Evidence that Demands a Verdict, which is evidentialist.
Also, I wouldn't recommend Sproul or Gerstner in understanding presuppositionalism. From the excerpts I have seen in their
Classical Apologetics, they misunderstand it.
I learned in Logic class that a circular argument is a logical fallacy. Then I am exposed to Presupp. which says that all arguments are circular.
In the way I do presuppositional apologetics, I don't even think the circularity issue would come up. The way I see it, everyone has a belief that is self-evident to him regarding who has the prerogative to interpret reality (autonomy/theonomy), and the presuppositionalist points out contradictions between this presupposition and other beliefs that the unbeliever has. The apologist then points out how his doesn't contradict. I think circularity would come up only if the argument is construed weirdly.
Personally, I don't like all the talk of circularity that has emerged in the presuppositional camp. It, like rabbit trails regarding the necessity of Christianity, only diverts from the important point: that the unbeliever is without excuse.