A GOOD REASON TO BELIEVE (3b) IS FALSE
In Part 9 of this series, I proposed the initial evaluation that premise (3b) is false. I argued that (3b) is false because it is a conditional statement and the first part of the conditional (the antecedent) does not logically imply the second part of the conditional (the consequent).
However, because Craig has provided a sub-argument in support of premise (3b), we should consider that argument before making a final determination about whether (3b) is true or false. If his sub-argument fails to provide a good reason to believe that (3b) is true, then we should conclude that (3b) is false on the basis of my initial evaluation, which gives us a good reason to believe (3b) is false.
THE SUB-ARGUMENT FOR PREMISE (3b)
Here is Craig's sub-argument in support of premise (3b):
1b. IF Craig's three key historical claims concerning Jesus' final fate can be historically established with a reasonable degree of confidence AND alternative naturalistic explanations for Craig's three key historical claims concerning Jesus' final fate can be shown to be implausible, THEN IF IT IS NOT THE CASE THAT the resurrection hypothesis (i.e. God raised Jesus from the dead) has been shown to be more implausible than the alternative naturalistic explanations for Craig's three key historical claims concerning Jesus' final fate, THEN the best explanation for Craig's three key historical claims concerning Jesus' final fate is the resurrection hypothesis (i.e., God raised Jesus from the dead).
2a. Craig's three key historical claims concerning Jesus' final fate can be historically established with a reasonable degree of confidence AND alternative naturalistic explanations for Craig's three key historical claims concerning Jesus' final fate can be shown to be implausible.
A. A historical claim C is an established historical fact IF AND ONLY IF historical claim C can be historically established with a reasonable degree of confidence.
THEREFORE:
3b. IF IT IS NOT THE CASE THAT the resurrection hypothesis (i.e. God raised Jesus from the dead) has been shown to be more implausible than the alternative naturalistic explanations for Craig's three key established historical facts concerning Jesus' final fate, THEN the best explanation for Craig's three key established historical facts concerning Jesus' final fate is the resurrection hypothesis (i.e., God raised Jesus from the dead).
Because (3b) talks about "established historical facts" while premise (1b) and premise (2a) talk about "historical claims", I previously introduced premise (A) in order to bridge the logical gap between the premises of this sub-argument and the conclusion of this sub-argument.
Also, because (3b) talks about "the best explanation" for a specific collection of historical data, while premise (1a) talks about "the preferred explanation", I modified premise (1a), so that version (1b) uses the same terminology as (3b), and now talks about "the best explanation". I assume that these are just two alternative expressions that Craig uses that have the same meaning.
THESE PREMISES CANNOT BE RATIONALLY EVALUATED
Clarity is the most important standard of critical thinking, but all three premises in this sub-argument for (3b) are unclear. As they currently stand, these premises cannot be rationally evaluated as being either true or false because they are too vague and unclear.
This is not a decisive and devastating objection, because it is always possible to clarify an unclear claim, or an unclear word or phrase. If we are able to clarify the meanings of the three premises, then we might well be able to make a reasonable determination of whether they are true or false.
Let's start with premise (A). This premise could be viewed as a definition of the phrase "established historical fact". The problem with this definition is that it is an unclear definition. The definition requires that a claim be "historically established with a reasonable degree of confidence." I understand the phrase "historically established". This means that one must provide historical evidence in support of the claim in question.
The remaining part of the definition is where the problem of unclarity resides: "with a reasonable degree of confidence." What constitutes the achievement of a reasonable degree of confidence? How can one determine that this degree of confidence has been obtained? This is like telling a six-year-old child to eat a reasonable amount of candy on Halloween. What the heck is a reasonable amount of candy for a young child to eat? That instruction is too unclear and too vague to be of any significant help or guidance.
Given the unclarity and vagueness of the phrase "a reasonable degree of confidence", we cannot form a reasonable judgment about whether a specific historical claim meets this standard or not. Thus, this definition is too unclear to be of any significant help or guidance. This unclear phrase occurs in all three of the premises of Craig's sub-argument for (3c), so all three premises, as they currently stand, are too unclear to be rationally evaluated as being either true or false.
Premise (1b) and premise (2a) include another unclear and vague phrase: "shown to be implausible". I understand the meaning of the first words "shown to be...". This is talking about providing evidence in support of some claim or view. In this case, the claim in question is that "such-and-such hypothesis is implausible". I also understand the meaning of the word "implausible". The problem is that, as Craig and I both are well aware, there is a wide range of degrees of plausibility and of implausibility. Because of this fact about plausibility and the related concept of probability, it is unclear where to draw the line between hypotheses that are plausible and hypotheses that are implausible.
For example, if we suppose that the Resurrection Hypothesis has a 25% chance of being true. Does that mean that this hypothesis is implausible? I don't know. Suppose that the Resurrection Hypothesis has a 40% chance of being true. Does that mean this hypothesis is implausible? I don't know. What if this hypothesis has a 50% chance of being true? Does that mean it is implausible? I don't know.
Obviously, if the Resurrection Hypothesis had a 90% chance of being true, then it would be silly to say this hypothesis was implausible. But when the chance of this hypothesis being true is down to somewhere between 10% and 50%, I'm not sure where to draw the line between the hypothesis being plausible and it being implausible. That is too wide a range of uncertainty for the concept of being "implausible" to constitute a useful standard or guideline.
Because premise (1b) and premise (2a) include this unclear and vague phrase "shown to be implausible", it is not possible to rationally evaluate whether these premises are true or false, as they stand, without further clarification.
CONCLUSIONS
All three premises of Craig's sub-argument for (3c) are unclear, and their unclarity is significant enough that it precludes rational evaluation of the truth or falsity of these premises. Only if we can somehow manage to clarify the meaning of these premises will we be in a position to determine whether we should accept or reject the premises in this sub-argument.

