The Smoley quote is still a reductio ad absurdum.
IMHO if you are going to cite authority then perhaps you could consider chosing more representative Christian scholars such as Thomas of Aquinas who said:
"I answer that, The author of Holy Writ is God, in whose power it is to signify His meaning, not by words only (as man also can do), but also by things themselves. So, whereas in every other science things are signified by words, this science has the property, that the things signified by the words have themselves also a signification. Therefore that first signification whereby words signify things belongs to the first sense, the historical or literal. That signification whereby things signified by words have themselves also a signification is called the spiritual sense, which is based on the literal, and presupposes it. ...Since the literal sense is that which the author intends, and since the author of Holy Writ is God, Who by one act comprehends all things by His intellect, it is not unfitting, as Augustine says (Confess. xii), if, even according to the literal sense, one word in Holy Writ should have several senses."
The above is from the Summa Theologica and has been a widely accepted position of Christian theologians, both Catholic and Protestant, for more than 500 years. IMHO if you are going to challenge someone on your show about his or her Christian faith then my suggestion is that you not expect them to defend or refute contemporary outliers, like Smoley, but rather dicusss the merits of the faith tradition's central thinkers like Thomas of Aquanis, Gregory of Nyssa, John Calvin, etc.
Criticising Christians believers for scientific innaccuracies is as old as Christianity itself but ultimately has no bearing on central Christian doctrines. Consider what Augustine, a highly educated man for his time, had to say about a preacher:
"Whenever I hear a brother Christian talk in such a way as to show that he is ignorant of these scientific matters and confuses one thing with another, I listen with patience to his theories and think it no harm to him that he does not know the true facts about material things, provided that he holds no beliefs unworthy of you, O Lord, who are the Creator of them all. The danger lies in thinking that such knowledge is part and parcel of what he must believe to save his soul and in presuming to make obstinate declarations about things of which he knows nothing."[/QUOT
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I am not a credentialed Christian scholar bur a lay researcher. Augustine IMO (and his biographer's) was a tormented man. He came to believe that even IF one believed in all of the Old Testament, and New, it was predestined whether he/she would go to hell. When he died the walls of his room were plastered with papers pleading that he be saved. Calvin was even worse. God save us from this self-hating theology.