It's in the thread title. I tried to make it as straightforward as possible. Let me try to rephrase it in a couple of different ways to try to be clearer.
"The existence of God, a god, or many gods, is not required in order for society to have a positive moral framework"
In other words, we can structure a society with a set of agreed upon behavior (enforced by laws, etc) that doesn't have to use "because god said so" as a justification for why something is good. The reason why something is "good" or "morally good" can be empirically derived. For example, if I consider life, liberty, and the pursuit of happiness to be goals that my society wants to maximize, we can organize our society with mutually agreed upon rules and codes of conduct that will ensure those particular values are maximized.
We can then test this. If we survey our population and see that more people are living longer and healthier lives, then we know that we are maximizing the "life" value, and that the system is working as intended.
If we analyze our population and most aspects of people's lives are free from coercion, the system is working as intended. If we compare our results with other societies who have structured their society differently, and see that our population indeed has more freedoms than others, then we have additional evidence to support our system. If other societies are shown to have more liberty, we can reassess our model, and alter it accordingly.
If we survey our population, and most people respond that they are happy, then we have evidence that our organization/rules/laws/moral code is working as intended. If most people respond that they are not happy, then we have evidence to show that our system isn't working and isn't as "moral" as we need it to be.
Nowhere in this entire process did we need to ask god to figure out what's good. We didn't need it written on stone tablets for us. We can just as easily derive "moral" codes of conduct through our own "god-given" (lol) reasoning and intellect. Do you really need God to tell you that "thou shalt not kill"? A society that prioritizes life can figure it out on its own.
So, in order to prove my thesis right, I have to show that you can reason your way to a moral society without invoking god. I just did that. In order to prove my thesis wrong, you have to show me that this was impossible. Some people would argue that since God created everything, and our society is included in "everything", then it must follow that God created the morality to govern it too. Sure you can say that, but that doesn't make it true. First of all you have to prove that God did indeed, create everything, which is another conversation entirely. This is why I wrote in my OP that I didn't want to delve into the realm of "does god exist" because that just complicates things even more. I can prove my thesis without needing to resort to proving or disproving god. Both "god-based" and "not god-based" societies have space to coexist, in my framework. Just because you CAN structure a moral society without appealing to a god, doesn't necessarily mean that those who do are wrong, immoral, illegitimate, or otherwise. We just came to a similar conclusion with different reasoning.
I have given examples of societies that either
1) Don't have a religion that includes an all powerful god who strongly dictates morality (which means they aren't relying on their gods for their primary source of morality)
or
2) Have written laws or other such codes of morality/ethics/conduct that don't have the phrase "because God said so" or any such language with that same effect
These would be such societies as:
Ancient Norse society, Greece or (pre-Christianity) Rome. They have a pantheon of gods, but some of them are assholes, and are mainly there to make cool stories or explain how the world works. They don't necessarily dictate morality as a divine edict. Additionally, Greece and Rome are famous for their contributions to the foundations of Western Civilization, due to their concepts of democracy and liberty. These concepts were debated on by philosophers in a forum, not handed down by Zeus.
Japan. They do have gods in one of their religions (Shinto), but again, these aren't gods that dictate morality. They just hang around and make things spiritual. Their other main religion, Buddhism, doesn't even have gods. It has a very enlightened mortal as its main focus (detail may differ depending upon sect, of course). You could possibly argue the case of Amaterasu, since in Shinto that god sorta created the Sun and everything, but again, you don't see any "because Amaterasu said so" in the way the Japanese have historically written their laws or structured their society.
Ironically, the one time in history that Japan was considerably IMMORAL, was when they
deified their emperor, so that he was a god and that his word was moral and final and the ultimate authority. They promptly turned into a shitty totalitarian nightmare, and got nuked for it.
The oldest continuous monarchy in the world, extending back to 600 B.C., has had an unbroken hereditary line of 125 emperors.
www.nytimes.com
The United States of America, and most other modern nations. The United States Constitution is a great document. It still holds up after all these years. It also has zero appeals to god contained within it that justify its codified laws. The only reference to any kind of religion is in the date. It also specifically and clearly delineates a separation between religion and government. References to God, a god, or the divine are more ubiquitous in the individual 50 state constitutions, but even then those are more like cultural markers and less like "do this because God said so".
If you look around the world, the amount of countries that explicitly reference god in their constitutions isn't that many, and even the ones that do would hardly be called theocracies, with some exceptions.
en.wikipedia.org
That is also why we refer to our system of government as a "democracy", and not a "theocracy". We are ruled by the people, not by a god, and we derive our code of laws accordingly.