The Argument from Reason as a Correct C-inductive Argument

Victor Reppert is well-known for his defense of the argument from reason (AFR).  This is a deductive argument in which it is argued that rationality cannot be derived from non-rationality.  However, let's consider using this argument as a correct C-inductive argument.

First, a correct C-inductive argument establishes that evidence for a claim makes the claim more probable than in the absence of that evidence.  For example, if a theft were committed and, say, John's fingerprints were found on the safe, that would increase the probability that John committed the theft.  However, it wouldn't be sufficient evidence, since it's possible that witnesses can attest to John's whereabouts far away from the safe when the crime was committed.  Let's look at the AFR, then, as a correct C-inductive argument.

1. In the cases we know of, a person's rationality is the result of some rational cause. (Premise)

2. In the evolutionary process, human beings are endowed with rationality. (Premise)

3. Therefore, evolution provides evidence that human beings' rationality is the result of a rational cause. (From 1 and 2)

In its current formulation, (3) doesn't prove that there is a Cosmic Designer (although I believe the Fifth Way demonstrates that there is a Cosmic Designer).  However, the inductive AFR does establish that in the absence of the evidence we have, the existence of a Cosmic Designer would be less probable.  Given that we have this evidence, however, the probability of the existence of a Cosmic Designer is increased.