Granted. I am using the concept of "fiction" as "not fact."
I note an ambiguity here. "Not fact" can mean a falsehood meant to be taken as fact, or as a story that is meant to be understood by both author and audience as non-factual.
Which is why I don't understand your objections.
What I'm objecting to is a fallacy of ambiguity on your part.
First, you compared the Gospel of Mark to L. Frank Baum's
Wizard of Oz, implying that we have no way of determining whether Mark is a work that is fiction in the same sense as the
Wizard of Oz, that is,
a story that meant to be understood by both author and audience as non-factual. I pointed out that this was implausible, since that the Christian community seems to have taken the Gospel of Mark as factual, and thus did not regard it as fiction in the same sense as the
Wizard of Oz, that is,
a story that meant to be understood by both author and audience as non-factual.
Next, you responded by noting that Dianetics was taken as fact, but that did not mean that it was fiction
in the sense of a falsehood meant to be taken as fact. Notice that you completely switched in midstream the definition of "fiction." This becomes obvious when one notes that since Dianetics was taken as something that was supposed to be factual, it was highly unlikely that it was fiction in the same sense as the
Wizard of Oz, a story that was meant to be understood by both author and audience as non-factual.
So why should we think that calling it non-fiction is relevant to the question whether the Bible is true?
We aren't talking about whether the Bible is true. The reason why fiction vs. non-fiction is an issue is that if the Bible, or in the case, really the New Testament, is non-fiction, then questions like, "What do the Gospels say that their writers would rather not say or are trying to hide, rationalize?", "What do the writers mention incidentally or offhandedly?" become relevant, and it's the answers to those questions that lead to info about the historical Jesus.