Piety

I see below, re-reading my previous post, that I used "adult" as a sort of stand-in word for "responsible non-belief". That's kind of revealing and indicates my starting point when thinking about the nature of reality.  

At this age, I believe I understand the enduring value of piety. I believe I did so when I was younger as well. But I viewed things through the worldview of a single religion, a religion which asserted a sole claim on truth. The worldview thus even extended to nonbelief, for 'not to believe' meant not to believe in that particular religion. I bought into this framework, and that made things complicated.

Belief can still be irresponsible. Especially where it's the basis of action involving other people not warranted given the level of uncertainty inherent to it. 

I understand that 'piety' and 'nonbelief' are not symmetrical antonyms.