That's avoiding the special pleading that is involved when you talk about the collective subjective view of Justice and fair-mindedness with it's lack of methodology falsifying god
Your capacity for distortion and 'misunderstanding' is truly staggering. Once again...
For my argument, it doesn't matter on what basis people arrive at a notion of fair-mindedness - all that matters is that people have such a sense and that, in broad terms and in some respects, it is agreed, and it is how we decide to trust or not trust other people.
If that were not the case, any theist claims that god is 'good' would be meaningless anyway. Here's a little parable:
If a company had a policy of summarily executing its employees, a year after they retire, unless they signed up to its pension scheme. They 'notified' them of this by making veiled references to it in various parts of a 1000 page policy manual. They then hid the manual in the fiction section of their library, beside a lot of similar but entirely fictional policy manuals with other dire warnings and other requirements to avoid them. The employees variously believed in the correct manual, the fictional ones, while some dismissed all of them because they were all too silly to be true. The company refused to clearly confirm or deny any of them but If somebody questioned them about this, their response was that people could investigate it for themselves and it was their fault if they didn't.
I would imagine you'd be hard pressed to find anybody that would regard that as fair.
Yet that is pretty much equivalent to what you are asking us to believe your god is doing.
Of course, you could argue that such a sense of fairness is a subjective human convention, not an objective truth, and you'd be right. However, that doesn't change the fact that this god is not behaving in a way that we recognize as fair, so predicting its future behaviour, regarding keeping promises, for example, would be futile.
Such a god would not be 'good' or 'fair' in any sense that is recognizable to humans.