Curious - can you point to a successful, functioning society where atheism was the norm?
Most of Europe is mostly atheist at this point and not generally more screwed up than us. Possibly even us. Sure in our current mode everybody that runs for public office needs to claim some sort of religion, but how many of them really practice it. And a serious chunk of our population is atheist, with just as large a percentage being what I call “yeah sure Christians”, that’s people that say they’re Christians but can’t remember the last time they actually did anything that actually relates to Christianity (go to church, read the Bible, pray).
And more will come, it’s really only relatively recently that some societies have evolved to the point where someone could actually publicly declare they are atheists, as the populace gets more comfortable with people that don’t participate in religion then we’ll have more countries that are basically atheist. Of course it’ll help if the militant atheist would STFU. But that too will come as everybody mellows on the situation.