The problem I have with that is that we effectively only have Gods perspective on the matter. And "proper morals" is retardedly ambiguous and in my experience usually breaks down simply into "only things I agree with" which further breaks down into "things that serve my purposes" which since you brought up the idea that those people were "self-centered" I refute that they couldn't possibly be as self-centered as God is as written.
In short, my main conflict of belief with most "religious" people is the topic of divinity. I wholly reject the concept that one beings viewpoint can be inherently more right "just because"
I am very much an egalitarian and feel that all sentient beings have valid viewpoints. I certainly won't claim to AGREE with those viewpoints, but they should at least be acknowledged as more then "not what I believe and thus wrong"
Alright, I'm going to focus on this point for now if that's alright as there is alot of strong opinion and indeed both very little material(multiple sources for singular events) and lots of material(many sources of singular events) that you are trying to bring up, and it'll be very difficult for me to come up with answers if I'm trying to tackle everything at once, unfortunately I'm not sure how I can answer this without going into a rant of sorts so... Try to bear with me?
For me, 'proper morals' is 'what most if not everyone agrees with'. Now... I want you to strongly consider this... If Genesis is to be taken at face value, we have mass rapists. Now in that situation, mass rape was considered by these people as perfectly acceptable, morally fine.
Now the big trick here is even during that time there was people who were against it for some reason or another, perhaps knowing they'd be targets for this. Which side of the fence are you on in this case? Do you agree that mass rape is acceptable in this context?
Of course, that is in the case that Genesis is literal, which is hard to believe at times. If it is poetic, then its use as proof that God is self-centered also starts to become questionable.
I'd still believe that from my position the New Testament is a better source for us than the Old, because there's much more fresh material at hand.
As for God being 'more right just because'... If God is to be believed as the creator of the universe, that'd apply to the mere concept of morals itself. He'd be defining what is right and what is wrong, and for us to define something as right when it is already defined in that matter as wrong would be on the same level as saying a stone should be weightless and float in the air.
As it stands, we live in the same universe where stones do not float, and as for morals? We seem to be able to decide what is right and what is wrong for ourselves. The interesting thing there is we have that choice, if God created everything we know, he allowed us to make that choice, and it's possible that could be mere choice of interpretation, or active choice to define. It doesn't look like he allowed for the second at least in all ways, but never the less he allowed something there, which is interesting.
Now that went off on a tangeant, but I'll admit I'm perhaps struggling to explain what I can.