Interesting conversation, Spock. Here is my take on that conversation:
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Very well… Let us explore this scenario. I will copy and modify the atheist’s answers, but leave the believer’s text alone… since I am not in the position to speak for them.
ATHEIST: What would you do if God commanded you to rape and murder? Would you follow his command?
CATHOLIC: That presupposes that God would command such a thing in the first place. We
claim that reason not only demonstrates the existence of God, but also that God acts and wills in conformity with his nature, which is good and loving.
ATHEIST: You can “claim” whatever you want… Claims are dime a dozen. Can you substantiate that your claim is true??? How can pure reason (which does not allow any appeal to faith or revelation) come to such conclusion? Because reading the Bible the picture is quite different.
CATHOLIC: There are many ways to respond to this. Let me try a more fundamental approach. As I said, the Catholic Church
claims that the existence of God can be known with certainty through reason. She also
claims that, through historical investigation, we can know that God incarnated in the man Christ Jesus and that he founded the Catholic Church. These are facts, we
claim, that can be known by all. They are also preliminary to the assent of faith. That is, recognizing them as facts is our basis for trusting in God and what he has revealed. Now, part of that revelation is the inspiration and inerrancy of Scripture.
That means that the inspiration and inerrancy of Scripture is an article of faith to be believed by faith.
ATHEIST: Unfortunately at this point you already deviated from you claim to using pure reason (and nothing else). Those “claimed” historical “facts” are nothing but parts of some stories, told decades after the alleged events occurred. There are no outside corroborating descriptions of these events. Your apppeal to faith does not resonate with us, since that faith is unsupported. And since you are at it… you could show that the value of “pi” is exactly “3” as “claimed” by the inerrant Bible… I can hardly wait.
CATHOLIC: See, your biblical examples, as you interpret and present them, are meant to undermine the classical theistic notion of the benevolence of God. Therefore, you are suggesting that the Bible contains theological error, and that is an attack on the inspiration and inerrancy of Scripture. That is
really what is meant by your biblical examples. However, the inspiration and inerrancy of Scripture is an article
of faith to be believed
by faith. We believe the things that God has revealed are true not because the intrinsic truth of the things is plainly perceived by reason, but because of the authority of God who reveals them, who can neither deceive nor be deceived. In other words, we have certainty of the inspiration and inerrancy of Scripture not because we have read every page of the Bible and have found no error in it, but because it has been revealed to us by God. Now, it
may be the case that the Bible contains what appears to be error, such as theological error, but because of the certainty of faith, we must say that the appearance of error is just that, appearance.
ATHEIST: Of course they are meant to do exactly that… and not just “attempt”, but succeeed. You keep on referring to articles of “faith” contrary to your original assertion that only “pure reason” will be used. You lose your credibility at an alarming rate.
CATHOLIC: No, not if God is an infallible authority that has revealed that Scripture is inspired and inerrant. So you see, attacking an article of faith is futile. Rather, your efforts should be at attacking the basis for faith itself - the existence of God, the incarnation of Christ Jesus, the authority of the Catholic Church, etc. Now, I do not agree for a moment with your crude interpretation and presentation of the Bible, but these fundamental principles of faith and reason do gut
entirely what was meant by your biblical examples.
ATHEIST: More conjectures based upon “empty, blind faith”. You promised fully rational arguments, and did not present even one…
CATHOLIC: What is convenient? That I did not conform to your caricature? Heh.
ATHEIST: Well, the usual outcome has appeared again. You promised a fully rational approach and immediately deviated from your promise. You did not offer even ONE rational explanation to the atheist’s comments. Now you declare the points the atheist bought up as a “caricature”… Do you really think that it will be accepted? The synopsis offered is anything BUT a caricature. Your “so called answers” were not rational, they explicitly were “faith based”. Try it again, but try to stick to your declared methods… rationality! And do not tell me that the “Church claims that reason and faith cannot be contradictory”… unless you can bring up a fully rational argument to support it… remember: “claims are cheap”, and “claims are dime a dozen!” And get hold of that
Catholic-annotated-Bible which would give you some actual ammunition to support your arguments.

So you could actually argue instead of evading the arguments.