[ozidar]

Did you read and get my explanation that a “concept of God” is independent of his existence and independent of the necessity of His existence for such a “golden rule” to exist and be universal?

Yes, I read it. I just didn't think it was relevant to the discussion at hand, which was about belief in God and the codification of God's laws being necessary for morality. From a non-believer's perspective, the golden rule does exist and is universal, they would just disagree on the "why" that is so. But if you believe I'm missing a subtlety I'll listen.

[MrB]

They would not just “disagree” as to the “why”,

they wouldn’t be able to logically explain the “why”.

And the point is, without the “why” answered,
any assertion is ARBITRARY, and therefore a meaningless assertion.