Thanks for responding, cteavin. Like you, I can't give an exact "moment of clarity" when I first moved at least as far as agnosticism, but perhaps in my late 20s.
These days, I sometimes consider my self an "agnethiest" – a bit of a nonsense term, or at best, an amalgam of agnostic and atheist, lol.
However, when I'm in a mixed group -- good friends and perhaps some I am meeting for the first time -- I generally use the term "secular humanist" if the occasion arises. SH seems to cause less consternation and knee-jerk fear than "atheist," most likely because half of them can't define it!
After 15 years of parochial (Lutheran and Presbyterian) kindergarten, elementary and high school indoctrination, I realized, a decade later, that I would benefit from reading books and essays to strengthen my critical thinking, though I won't leave a long list here -- perhaps that's another thread!
For anyone curious about the central non-religious voices of an era, the two-hour, 2007 roundtable by The Four Horsemen of Atheism -- Hitchens, Dawkins, Dennet and Harris -- will, at least, stir one's thoughts:
Youtube Video
Recently, I joined the Freedom From Religion Foundation (FFRF), which could be of interest to people of belief and non-belief, as long as they value (here in U.S.) the constitutional separation between religion and government. One of their best-known members is former SNL regular Julia Sweeney, who has performed plays, written articles and made appearances that help show we are not a bunch of dour, self-defeating nay-sayers, and actually doing a lot of "good without god."
In a bit of foreshadowing, in 2012 she rallied against allowing employers to deny health coverage based solely on their own moral and religious beliefs…
Youtube Video
…which are exactly the protections President Trump rescinded (along with LGBT protections) only a few days ago...
http://www.chicagotribune.com/news/nationworld/politics/ct-trump-religious-rules-birth-control-lgbt-20171006-story.html
While the Tribune article is focused on birth control, a logical extension would be, if you worked for a Christian Scientist, they could conceivably rescind all your health coverage, as they don't "believe in doctors."
That's my novella for today, but again, welcoming anyone else with a related story to tell, real-life experiences and anecdotes, etc. …!