I gotta say, it's pretty fucked up no matter which way you cut it that Abraham was about to kill a child.
Like, at no point does the faith make sense there. Nobody ought listen to any voice inside their head telling them to kill a child, at any point, to any extent, because it cannot be faith if you do not go through with it to whatever extent the voice says.
We know that Yaweh is credited with killing children himself (ol' fluddie), of ordering others to murder children ("dash them upon the rocks"), with letting others who want to murder children to have their way (the Job job), and with the deaths of children in general (can anyone say "childhood leukemia"!)
I would say that's out of place in terms of godlike behaviors, but the fact is that I've watched plenty of people who create simulation environments so all sorts of bad shit with children, everything from forcing them to carry their dismembered, rotting loved ones to corpse storage piles, to just smashing them under drawbridges because it takes too long to train them to do useful work or because they saw too many rotting corpses and now like to play make believe in the corpse pile...
The result is that I can absolutely believe that a creator god would be exactly as fucked up as Yaweh, because I've seen it happen a time or two. It's just that very little of what we see even in reality is actually consistent with such a fucked up narcissistic creator.
None of this makes such conduct moral, though, and might does not confer authority. It's still fucked up to create an environment and make any of that happen on purpose and it's still wrong to ask someone to kill their kid.
If someone needs to test whether some subject has faith, you would ask them to do something completely nonsensical that had some practical effects... Like revealing unintuitive steps of the "tech tree" all at once to someone who would know what would happen before it happened without any other plausible means of them knowing (such as directions on how to make a generator and light source).
The test is whether they would spend years of their life acquiring, working, and assembling materials to implement something so far-fetched as putting together a box, filling it with vomit and lead, and wasting shiny, precious copper on stuff that isn't jewelry or bronze with no reason to believe that it will make anything happen at all. It's actually an EFFECTIVE test because the whole "kill your child" thing is just a raw coincidence.
Let me ask something then: if instead of Abraham being asked to kill his kid, he had been asked to build a lightbulb in the bronze age, and spent years beggaring himself to do it, would you believe that it had been an actual test of faith? I sure as shit would.
The issue is that every such "sign" in the bible is so ambiguous and weak it boggles the mind to think how people would fall for that shit.