I have read threads started by various people questioning where morality comes from. The faith in a god believers start threads with a baited question. The idea is to trap atheists into accepting that morality can only come from a christian god. They use revisionist history to prove their point.
They refer to the bible as the authority on morality. This is a false pretense.
They cite historical documents, cherry picking them, enhancing and embellishing them, to make it seem that all law, morality came from christianity. Again, a false pretense.
Comic books possess more morality than any bible I have ever read, and I have read a great many of them. The Codex Sinaiticus for one. Which happens to be the oldest bible ever found. Bibles are varied and different, rewritten and edited to fit a political narrative that the editing authority desired at the time. It's obvious that al bibles come from human imagination and nothing else. As science proves more and more about the real universe, the imagination changes and prompts an edit to try and keep the bible relevant.
Evolution prompted the "intelligent design" variation. Finding out the age of the Earth and the Universe, caused the bible believers to move the goal post again to throw out the concept of original time, replacing it with a wholly unreasonable definition.
Now there comes the old and yet reintroduced idea that all western civilization is based on christianity, and by default, the concept of morality and the basic law is also christian based. This is completely false.
Although the prevalence of christianity cannot be ignored, at the time of the American Revolution, "Free and Critical Thinkers" emerged To not only challenge christianity but to in fact dismiss it as flawed. These founders gave birth to law based on the freedom of the individual. This is not new. It comes from ancient Athenians who created a concept known to the world as "Hero." this prescribed that a mere mortal gained full control of his/her destiny. That gods had no part in their thought or determination. This concept is the basis of western law and morality. It is a Liberal and a Progressive idea that dominates Western law but specifically American law as the foundation for moral and ethical standards for societies. In their wisdom, the founders of the United States did not leave christianity behind. They incorporated a protection of free thought and expression, not to incorporate christian values, but to protect an individual's right to believe or disbelieve any idea that they chose. This right is purposely made to be an individual right so not to infringe upon the freedom of thought of any other individual that they may enjoy the same freedom. The Constitution of the United States of America bears that out with the Establishment Clause found in Article I. This is further substantiated by the Treaty of Tripoli Article 11.
Morality itself is solely dependent on the society that frames it. It could be a society of one or it could be the world at large. The extent is dependent on who defines it. It is also subject to time as morality is dynamic. It changes over time within the defined society.
I will not accept and will vigorously fight any notion that morality is caused by christianity and that the christian bible (whichever one chosen) is the authority of morality. Even chritian morality is highly subjective. Within christianity itself there are wild variations of what is and is not accepted as moral.
The real question is whether morality is instinctive or not. I tend to think that it is. Wild animals display a moral code for survival. It differs from species but it exists.
In summation, I conclude that morality is subjective and defined by each society and the scope of that society at that specific time. That it originates as a necessary tool for survival. That it is organic and evolves. That there is no objective morality and cannot be. That christian morality cannot be defined as one everlasting thing and is NOT the basis of Western law but rather merely an influence that has lost and will continue to lose its significance.
"This nation is a nation of laws, not men." this quote about the new nation of the United States of America is extremely important because christian values (morality) is based on "men." The idea that a king is ordained by a christian god, that his word is law because it is the worldly voice of that christian god.
The birth of America threw off the yoke of christian morality/law in favor of self-determination of individual freedom of laws made by individuals and representatives of those individuals for the sake of self-governance and NOT the rule by a christian authority.
Thus law and morality in the United States is the antithesis of a christian foundation and the birth of individual freedom.