Well thats a great post. I'm mostly uneducated in philosophy too, so I'm not bothered by that one bit.
"Meaning" is a excellent issue to examine for exploring materialism vs the soul or spirit.
When I put on my materialist lab coat (which I'm not always wearing), the explanation I give for meaning goes like this:
The eye evolved to doing seeing tasks (as you noted).
The ear evolved to do hearing tasks.
But the human brain evolved the capacity to do thinking tasks. And while the specific thinking tasks needed for survival were probably pretty finite, the mere capacity to think opens us to near infinite possibilities or ideas: in other words imagination, the capacity to invent things and ideas that are currently not real - or perhaps may never even be real.
Among those ideas is could well be "why?".
Why do seasons change and come back around in a circular fashion?
Why does lighting split the tree in half?
Why am I here?
A related explanation is that we observe in our own minds a purpose for every action we ourselves do.
Why do I make fire? To cook food.
Why do we go north? To hunt bison.
etc.
And, finding a positive reasonable answer for every question, we project that sort of expectation onto nature, onto everything, resulting in questions like:
Why am I here?
Why is the world here?
etc.
So, I think thats the origin of the demand for meaning. We dont demand it because its actually out there (though it may well be). We demand it because we have the basic capacity to ask why. And a single unanswered "why?", when everything else seem to have an answer, is really unsettling.
You're right, 'Belief in meaning as pointing towards the existence of meaning' vs 'Beings with higher levels of cognitive/curious traits that naturally results in thoughts about meaning' are great theories to pit against each other. At the end of the day I simply believe that every time this 'Meaning' trait of ours causes evolutionary theory to look like it has gone awry, that nudges me closer to siding with the 1st theory, that meaning is an actual thing. Now personally I don't think that the reverse would be true, that if something makes evolutionary sense it would drive me towards the 2nd theory (since evolution could be part of the stage among this grand play called human meaning).
The unanimity factor of the human obsession with meaning nudges me towards the 1st theory. This factor actually turns into a 2 part question. When a human sits on top of a cliff and stares at all the different species doing there thing, it's not just a 'Why?' question (about this existence up on this cliff) that's ingrained inside of the human mind, but it's also a 'Why am I the only species obsessed with asking Why?' that is strangely only a trait that we humans have. Unanimity in and of itself is evolutionarily strange to me. But the unanimity factor of curiosity driven invention is even more strange to me because it is absolutely crushing the 'Survival of the fittest' capabilities of so many non-human species, how many species will humans cause to go extinct before a 2nd species evolves with creative intelligence of their own in order to protect themselves from us? This monopoly we have on curious creative intelligence (which causes the byproduct of a belief in meaning) strikes me as not making any evolutionary sense. Other species should be competing. This is evolution flat out playing favorites.
This curiosity/meaning quirk also damages the literal mother nature that created us. Even prior to technology humans have done disastrous things to mother nature like relocate other species around the planet, totally disturbing natural predator/prey balances. Start opening the conversation up to human results of curiosity driven technology and the list goes on & on...we've damaged the ozone layer, we've dumped toxic waste all over the planet, we can now cause a nuclear holocaust on Mother Earth, etc. I think it would make more sense for mother nature to find a 'Better Solution' to deal with this psychopath species called humans, instead of just letting us run our course until we end our own existence (how about unleashing a much stronger Black Plaque on us? That would make sense to me as a smarter evolutionary solution). Actually I might take that back...I first believe that it would make more evolutionary sense for this disastrous 'Meaning' trait to never evolve in the first place.
I don't want to present straw man counter arguments (well, I'm more thinking out loud than arguing with you) but in my experience the counter often comes back that Earth doesn't care, that humans are a joke and the 4.5 billion year old Earth will just heal itself eventually. But I think this is like a person who likes to cut themselves as long as they don't cut too deep and cause fatal consequences (cutting yourself, a whacky behavior original to only humans). Wouldn't allowing the continued existence of humans actually be like mother nature cutting herself in a sense?
Now it is true that other organisms have wreaked havoc on mother nature (as opposed to respecting the parameters that Earth gave them to live in). But these are organisms that don't even register on the scale of cognitive self awareness. Very strange how the self destructive (towards) Earth trait completely skips over all organisms that are even remotely self aware, and lands right on us humans, the most self aware organisms that there are. It's a constant tugging on me that there is something 'Special' going on with our evolutionary status. I've said it before in here that I think it's strange that in biology class we are 99% identical to chimps, but in history class you feel like you should have your head examined if you think that humans are similar to chimps. Which implies to me that physiological similarity is drastically overrated.
Have u ever seen the very bizarre movie Clockwork Orange? If you have, they took a sick twisted violent criminal and they did an experiment on him. After the experiment he became extremely nauseous any time the urge to commit violence came upon him...he couldn't do it anymore. I think it would at least make more evolutionary sense for our curious/meaning trait to be accompanied by a much higher natural degree of disgust at the thought of harming the mother nature that provides for us.
Other species are so much better then humans with being innately knowledgeable about not destroying their natural habitat. The Clockwork Orange analogy, I think a toddler (if evolutionary survival instincts were the same for humans as other species) SHOULD not have an instinct to want to rip the family's garden apart if he is accidentally left inside of it. The child has just destroyed the family's food supply, that instinct makes no sense!! There should be a Clockwork Orange type of 'Bad' instinctive feelings about doing that.
Now, humans DO have the instincts to take care of their habitat to a certain extent, that is true, BUT the strength of such an instinct pales in comparison to other species. It seems to me like that's a major hint that our instincts are in PROPER proportion for caring more about meaning than for caring about habitat proliferation. After the infant phase, that toddler cares more about his toy then he even cares about eating dinner, and even if he didn't eat yet and is hungry he'll cry if you yank him away from the current 'Meaning' he has attached to that toy.
Our good traits are also bizarre, not just the bad. Things such as altruistic actions that not only do not benefit us, but actually hurt our survival situation.
I mean even if I threw the Bible out, and became skeptical & cynical about every faith, I still can see myself defaulting into the belief that humans are at least evolutionarily 'Special' in a bad way. That humans are the only species that we know of that ponders meaning is bizarre enough...but couple that with evolution playing favorites with the one and only species that ponders meaning and I think that puts us in a situation where something else is going on here...and IMO what's going on is that these are all clues that meaning is actually a true reality outside of chemical compositions of human brain matter.