NS,
By reference to codified models of these things. The argumentum ad consequentiam for example isn’t an objectively bad argument because I rely on my (potentially faulty) reasoning to find it so. It’s a bad argument because anyone can look it up and test it for themselves.
This incidentally is something I always look askance at. Those who would argue for “god” using logical fallacies already know them pretty much to be logical fallacies. They know this because they know that using the same reasoning for something else fails when they try it. Thus, say, using “you can’t disprove god, therefore it’s true” would also apply to anything else they think not to be true.
But it's the individual that decides the argument is a specific fallacy, and their reasoning, or understanding of the statements may be faulty so it cannot be declared objectively true.
Your idea that those arguing for god actually somehow know that they are making fallacious arguments, that they are fallacydodging as opposed to goddodging, reads to me as an argument from incredulity, in that you cannot believe that they don't see what you see. You will no doubt disagree so how can we state things objectively about arguments?
Yes we are. We have ordinary dialogue here all the time. If every OP was met with, “I have no idea what you mean by “god” so there’s nothing to talk about” there’d be no discussion at all.
We have some ordinary discussion but I would suggest that ordinary discussion sort of runs out after
'I believe in God, do you?'
'No.'
'Are you sure?'
'Yes'
'Oh well do you want a cup of tea?'
If we are in the world of discussing epistemology, and logical fallacies, we are necessarily going to have to ask 'What is your definition of god?'
As you’re fond of reminding us, “evidence” is itself a naturalistic concept so applying it to claims of the supernatural would seem to be misplaced. The complaint that “but all you’re considering is naturalistic evidence” is particularly otiose I find because it just assumes that there’s a non-natural version of it. What would that even entail I wonder?
Which illustrates both that we aren't just have 'ordinary discussion' in that the point is being made, and we aren't just accepting a simple idea of evidence, and my point that if you want to have any worthwhile discussion you need to agree terms in more detail.