[advocatus diaboli]That is, let me take this stance, open to discussion, if You take into account and trust in the stories where the judeo-christian god indeed came down and handed to Moshe not only commandments two times, but also a set of laws.
Well historians reckon that moses was hundreds of years before the Hebrews found monotheism, so he was probably a pagan. That aside we have to believe god spoke to these people, if he just said ‘hi’ now it could be recorded and hence not subject to conjecture nor interpretation. don’t you think that if he did just come down and tell us ‘the law’, then it would be something of an insult to our intelligence and his? ‘Every landscape has its own vocabulary’ ~ morals have to be adapted etc.
My cousin talks to god every day at least once. If that is not a god popping up on demand I don't know who is.
It is Your implication alone that denies everybody to bring that into this discussion.
That is if you consider the inner voice to be god!
The idea here is not to exclude, as soon as you say ‘I know what god says’ then surely you are being exclusive.
Given the way modern people behave and people in ancient times have behaved, I could name some:
respecting your parents - who could think of that when you look at account from ancient Egypt to modern times
Most people respect their parents albeit often to a lesser degree. That does not allude to a moral from god, but to societal change. we have less violent discapline which also means we have less rapists etc.
not to kill fellow humans seems to be impossible when you look at ... but You know what I will be saying. Some cultures make differences between what is human and what is not. Who has invented the overall moral that it is no good to do so (except in war)?
Not to kill has always been something of a contradiction even to its advocates [the bible has many cases of justified killing]. Really to kill another human you are seeing that person as not worthy of life, surely this is true in every case regardless of culture and politic. On the other hand, in ancient times if there was no war there was the threat of overpopulation [possibly; a god of war may advocate war and be right in such a case?].
love your neighbour ... well, well! Neighbours kill each other over mowing the grass on sundays or punch each other over barking dogs! Ask an American to pay for a general health-insurance, and you will see what happens to "love your neighor" or "divide your bread"! Whose idea was it to love the neighbour or any stranger as one would love oneself? It was no Celtic chieftain I know of, nor any Greek nobleman. Mayan farmer - I'm not sure.
Again this is societal and rarely held by said society e.g. look at the modern jewish agenda; preach multiculture then build walls two stories high between them and their neighbours! I think that moral is more an ideal. Who knows where these things originate, jainists in India certainly believe in such things and indeed take it to the extreme of not killing nor harming anything at all, not even insects where possible. The Persians also had a lot of influence on the jews, perhaps Mithras taught such things, I am not so sure.
As far as celts go, we derive a different kind of morality from them, when the roman africanus attempted to conquer Scotland he could find no leaders to make deals with. To have civilisation like the romans had you had to have all that went with it, hence the Germanics and celts [same thing really] hated it.
If you like we could go over one moral at a time and see where it derives from societal or intellectual sources, but I think you will be hard pressed to find one that doesn’t! ~ I.e. is from god not man.