I grew up non-religious (mostly) but I also was a boy scout, I read Hardy Boys, and I naively thought that we were (again, mostly) working towards building a better world for each other and we all had a responsibility to do our part for each other. When I went camping, or to parks, the mindset was "leave it better than you found it". And I thought most other people generally felt the same. But now I mostly just feel like a big middle-aged dork when I pick up Taki's and Orero wrappers at the playground.
Now it feels much more like "everything is going to shit so grab what you can while you can". I don't know if the world changed, or I was just painfully naive.