It can easily be shown that humanity does not derive ethical standards from religion.
Obviously even the great majority of those who follow Christianity (and Judaism and Islam for that matter) pick and choose which commandments written in the Old Testament (sacred to all three religions) they accept as justifiable and reasonable. They use ethical standards acquired elsewhere than in holy writings to decide right and wrong, and to select those rules and actions in the 'holy books' to take notice of and which to put aside.
Traditional Islam holds that Mohamed was the ideal example for Muslim behaviour, yet no decent modern Muslim would say that having sex with a nine-year-old girl was an ethical thing to do.
In regard to Mr Folau I will confine myself to writing only that he was dismissed due to breaking his contract conditions, not due to his religious beliefs.
In regard to the 'freedom of religion' complaints, I will make the point that I find twenty-first Christians complaining about limitations on their freedoms a bit rich considering that over the centuries during which Christianity was running Europe they provided no freedom of religion; people either toed-the-line or burned. See Christian intolerance on this site for many examples, and Giordano Bruno in Wikipedia too.
It is plain that the dominance of Christianity didn't lead to ethical behaviour then.
The burning of fossil fuels, especially coal, is a huge environmental disaster, being one of the main causes of climate change and ocean acidification; its air pollution kills millions of people each year;
Both Abbott and Morrison dishonestly and stridently opposed action to reduce Australia's emissions. I have argued on another page that those in a position of power who knowingly lie to slow the transition to renewable energy should be included among the worst criminals in the history of mankind.
The religion of Prime Ministers Abbott and Morrison certainly did not make them ethical people.
Religion does give an incentive to behave well. What can replace the religious incentive for ethical behaviour?
I suggest that ethical behaviour brings its own rewards. Behaving badly gives a person a bad reputation and having lost one's good reputation is a great disadvantage in life. Getting back a good reputation once it has been lost is much harder than holding onto the good reputation by behaving well. I also suggest that one cannot have self respect if one behaves unethically, and there is little more important than self respect.
Having said all this, I do wonder whether much of the unethical behaviour that we are seeing in the early twenty-first century is due to the loss of the fear of Devine punishment.
Many people are indoctrinated in religion by their parents and religious institutions, far fewer are educated in ethics. Education in ethics should be a standard part of any child's education.
External sitesReligion does not determine your morality; 2018/07/25; Jim Davies for The Conversation. If I attempt to summarise Davies' argument, it is this: religious people come to their own conclusions about what is right and wrong, then they hold that their conclusions match what God wants.
On this siteEthics
Christian virtues and values
Religion, Superstition and Pseudoscience
Is God real?
Why the concept of an immortal soul is absurd and the existence of an immortal soul impossible
A list of my pages concerning ethics