Travlyn, you're dead-on about symbolism, and it goes even deeper. This is something I've been studying a bit for my dissertation, and I was discussing it earlier today, so forgive me but I'm about to get nerdy.
Some of this is common sense, but every letter of every alphabet today, outside of Asian logogramatic scripts, derived from Egyptian via Phoenician. The Egyptian glyphs were clearly images denoting the thing they referred to, but as different cultures abstracted those rarefied representations, the images became stripped down to what we recognize as letters. But for a long time letters retained some of their symbolic meanings that extended beyond their phonic valences. Take the letter A; it was originally written upside-down from how it looks today --∀ -- and represented the
aurochs, a now-extinct giant species of cattle. The letter M came from the word for water, mem, and was meant to look like waves, while the word for N, nahash, represented a snake.
So what, simple enough, right? Yeah, but what's interesting is that before literacy was so widespread, when it was still the domain of the shamans and bureaucrats and functionaries, they still retained some of that sense of symbolic meaning. That makes considering some old symbols and documents kind of like dealing with puzzles that need decoding in order to grasp the full meaning. I've been looking into the letter D, which at one point represented a fish -- dag -- and later came to represent door -- daleth -- and how that symbolism is worked into Pythagoras' cosmology; the letter looked very similar to the vesica piscis (fish), and long before Jesus, Pythagoras both considered the fish sacred and referred to the vesica piscis as a doorway between the world of spirit and the world of matter -- from fish to door. He basically encapsulates the evolution of the letter in his cosmology.
Such meanings and resonances may be one reason why literacy was so often reserved for the select few; if they thought language and letters had a kind of cosmic, magical quality, then it'd take all kinds of both intellectual and moral training to be trusted with it. It was workers/builders like the Phoenicians who started to democratize alphabets more or less to keep records and effectively do their jobs as they boated around the Mediterranean. That's also one of the reasons the poets of the Gaelic Order were targeted during the Anglo-Norman invasion of Ireland; they were just below the nobility in status, and their facility with language was (irrationally) feared. But as I understand it -- and this is where I get a bit hazy and you may be able to offer something -- the democratization of language and symbols wasn't always looked well upon, which eventually resulted in groups like the Masons using symbols/language in coded ways so as to protect themselves, in a sort of equal-but-opposite way as those past shamans, bureaucrats and functionaries. Does that sound about right?
By the way, what's the Blue Lodge? I don't know too much about Masonry, but my understanding is no atheists allowed, although one branch out of France (Grand Orient?) does allow atheists. I was looking into this recently when I came across
an article comparing Masonry to the martial arts.