First of all, the premise of the thread is not that religion is not necessary. It's that a god isn't necessary. I explained the difference earlier. "religion" does not appear in the thread title, but "god" does. And I already have examples.
All the countries you listed have Gods that helped determine morality. Just name one country, man! One that has not had a God /Gods. If morality sprouts from nothing, this should not be hard.
So am I. Just look at the individual country numbers too. Christian numbers are falling, but they are healthier and as non violent as ever. Japan has hardly any Christians in it at all and yet Tokyo is in the top 10 of safest cities in the world.
Japan was nuked for its transgressions in WW2 and was promptly rebuilt by a Christian nation.
It also has the presence of religion and Gods which helped determine its morals.
The Bible actually condones slavery. I thank my own reasoning skills for this moral decision.
And you would be wrong.
We are also talking about Christianity and the NT
1. Slavery in the first century was quite different from slavery in early American history. For one thing, Roman slaves were either taken as the spoils of war or were such because they sold themselves into slavery (known as "bond-servant"). They were often well-educated (cf. Gal 3:24 in which...
bible.org
If you postulate God exists then it's on you to prove it, and that your particular brand of God is the correct one.
I'm not looking to prove God exists in this thread. I was merely pointing out that the premise kids knowing "right from wrong" whatever that may have been (no study was provided) didn't disprove God.
As for the thread title, I am not necessarily in agreement. Religion is kind of the fast food version of morality, packed and marketed in an easily digestible way and provides a sense of community, ready made and put on a shelf at the supermarket for your consumption.
The life of a Christian is infinitely more demanding than that of an atheist, all things being equal. Most religions require far more out of the individual than an atheist lifestyle. I agree that it helps foster community, though.
Societies looked to gods in the past, and still do, because there are gaps of their knowledge and it's easy to throw god into those. As societies progress, they become less and less necessary, as people need to look to gods much less as their immediate needs are more easily covered and have less desperation in their daily existence.
There has never been a purely secular society in the history of humanity. The ones that have tried to jettison their religions have been responsible for some of the worst human atrocities. There hasn't been a single example given in this entire thread of a country and that began secular, developed secular, and prospered secular.
What we see right now is hubris. And it has led to woke-puritan crazies, communists, and in places like Europe, Islam.
Societies do not "outgrow" religion. They decay and collapse.