goodness is relative to the person ascribing that quality to someone else. You can’t be “good” unless someone tells you are good from their reference point as I understand it. So you may believe your deity is good, but I might not.
Conscious creatures that can communicate to each other can come to an understanding what each creature values as good for them. If there is overlap, great. Like the not beating children. If there is areas where there is not overlap, then there is conflict. Such as, for me, slavery. I’m anti-slavery. Might have a conflict with your biblical deity here. But this is irrelevant to me since I can’t tell the difference between your deity actually existing or an imagined literary figure. Not going to have an argument with Shakespeare’ Puck.
My arbitrary reference point for my version of absolute morality comes from referencing Human Well-being. It’s like referencing nutritional state for people. Is eating apples or oranges objectively good or bad when referencing nutrition for people? not really. but it is objectively bad to drink battery acid. As to picking a deity as a reference point of morality, to me that is no different than picking bob next door. But at least everyone in the world can talk to bob and ask him what is good and bad. The deity reference is no different to me than using Puck from Shakespeare as a moral reference point of absolute morality. What would Puck do? Well until everyone in the world can talk to Puck and agree that Puck should be the reference point we can then go from there, but that’s no the case of this reality so far.
Disobeying the “Master” - Beating the child is bad in reference to human well-being, so by pass the master and just use human well-being as a reference point. AKA be good for its sake regardless of the most powerful person in the room. Also, we can only be good as far as we understand what good is. Example: using pi to solve a problem. If we can not tell the difference in the solution from using pi to the 5th decimal place instead of any other value of pi beyond the 5th decimal place, did we have an absolute answer to that problem? No we did not, since we can only answer the problem as far as we can understand it. That is why good and bad is in reference to what we understand, in reference to our well-being regardless of the “master”. The cultures that did not value “not beating their children” died off and we are the products of people that succeeded since we valued not beating our children.