Immanuel Can wrote:Fair enough. I didn't mean to sound like the "No True Scotsman" fallacy there.

I just don't think that with that understanding of "faith" anyone could be really sure what one actually believed.
One is believing something contrary to all evidence, or knowing that is was untrue?

In what sense, then could we even say one "believed" it (or "had faith in" it, if you prefer)? But you're quite right, of course: ordinary folks get all sorts of things confused from time to time.
But it's also true that if we want to put a serious question to a point of view, we're always well-advised to select the most articulate and intelligent proponents, rather than selecting the most philosophically naïve version and kicking the straw out of that, as you suggest.
In your defense, I wasn't taking your comments as a logical fallacy so much as
potentially leading us down the path of categorizing "real Christian" as one having correct belief on more than a few fundamental issues. I don't think that's what you intended (and your response here only serves to confirm that), but I've seen too many try to do that and just wanted to "go on record," as it were.
As for the more technical part of your response, I agree. The New Oxford American Dictionary offers two definitions of "faith":
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1 complete trust or confidence in someone or something: this restores one's faith in politicians.
2 strong belief in God or in the doctrines of a religion, based on spiritual apprehension rather than proof.
It's clear it's the second definition that's on trial here, but even then, this apparently strict separation between "spiritual apprehension" and "proof" strikes me as misguided, especially when "proof" is defined as
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"evidence or argument establishing or helping to establish a fact or the truth of a statement: 'you will be asked to give proof of your identity' | 'this is not a proof for the existence of God.'"
At best, there's terminological slippage here, especially given the usage examples the dictionary provides.