approximately age four when I literally rejected the notion of a loving God along with the idea of Father Christmas and the Easter Bunny.

Good on you! I was raised what I call funeral-Christian. We would sort of half-assedly pray whenever anybody got sick or died, but my family was totally uninterested in religion otherwise. My sister asked if we were catholic at age 16 or so, to the amusement of all adults concerned. I sort of vaguely thought we were freemasons because I found my granddad's old masonic junk in a drawer. Not sure why I never thought to just ask...

But I was a total moron about Santa. I actually managed to invent belief-in-belief in Santa ("maybe Santa doesn't actually exist, but does that really fundamentally matter?") at about age 7. So I'm working off a huge rationalist karmic debt.