This is stupid and ends the conversation. If we have no ability to understand anything beyond human concepts, then God is literally unknowable and there is no way to say if morality "comes from" him or not. It is literally nonsense to talk about God at all. Although the case isn't made at all as to why "reason" and "arbitrariness" are humans concepts and the only reason you are saying they are is an ad hoc defense to your argument.
your putting words in my post with this one friend i simply stated you cannot expect to limit the creator to the abilities of what his creation that is given a different set of abilities with a physical limit is capable of that is all the rest is from you
And the question of where does morality come from can mean different things. Morality as an abstract set of rules might come from 1) maximizing happiness which is call utilitarianism 2) commands that all entities can reasonable assent to which is called deontological ethics or 3) performing the best that you can in your specific situation which is called virtue ethics.
where do morals come from all of the above 4)
Those lead to the question of why humans have the impulse to make these codes or to call actions morally right or wrong or to feel certain pulls to acting morally right or wrong. I said it has to do with the evolution of the mammalian brain. For example,
mammalian offspring bonding is probably the source for some of it. Evolution isn't just fukk YOU I'M GOING TO SURVIVE at all costs. It doesn't work that way. If it did then mammals wouldn't be evolutionarily viable.