If that were even remotely true we would nee to psychoanalyze everything in the environment for what symbolic purposes they were made and for our interactions with them.
The questions of existence and purpose seem a lot more persistent than simple environmental factors.
Which makes it environmental anyways. I dare you to find a cause in behavior thats not environmental. Look up baby psychology.
Existence though is fascinating, as is consciousness, but to presume without evidence is certainly fallacy.
People who ponder such things have the TIME to ponder such things. This implies its environmental. Also depression increases with boredom, which proves its psychological. Regardless of environment? Please do as much research as I have into the causes of depression before you conclude IT MUST BE THE HEAVENLY FATHER! Your heavenly father drives people to suicide who don't know about him? How omnibenevolent of him.
Both those who achieve great practical success in career or achievement, and those who live fulfilling social lives and families still have moments where they sit down and think "what is it all for". It seems to be a question driving people both to great depths and suicide regardless of their environment. I'm not arguing that environment has nothing to do with it, but I have yet to see it demonstrated that there is a remarkable kind of person out there who never wonders such things.
The closest thing would be people who have sought and seem to have found an answer. But definitely not for people who argue that there is no question to begin with.
If there seems to be a desire within ourselves that nothing in the world can satisfy, perhaps it's possible that said desire was meant to be fulfilled by something beyond the world?
Nomads wondered less because they were more busy, its evidenced by the differences in their tall tales and myths, compared to sedentary society's. The difference being no dogma, its about understanding and learning their environment, it was made to be confusing to be easily remembered and pondered about in relation to tasks they needed to develop, thus it was beneficial to their survival. Just like its beneficial to be part of a community, even if they are wrong, it means more help regardless and who can compete against numbers of people all by their lonesome?
Did nomads need purpose? Life simply was. Temples were not built til sedentary lifestyles emerged. And their stories and myths were to cause a deeper understanding. Its like combining confusion curiosity planning and possibility. And psychology dictates those feeling confusion hear contradictory facts. But it makes things more interesting if people only subconsciously recognize it as inaccurate, perhaps. Giant wolves and beavers fighting which formed the Mississippi and its basin? A story involving such forces them to imagine it, then when they see how massive the region is, it feeds into the idea of how great and massive they must have been. Its like stretching the imagination for better structure on working around those animals (both have to do with rivers, without wolves rivers change its been factually proven, and of course beavers make sense too, and a lot of natives loved wolves.) Originally the fact would be there perhaps, someone might have known it, then shared it. But remembering a fact is climactic. A story that seems impossible is not climactic, it continues to be shaped, and thus had social benefits to develop it over time, and to remember the more imaginative ones. Ones which could help the generations better.
With the advent of religion that changed to dogma. Behavior is what determines the course of the village or town. Thus they tried regulating it severely. Even innate curiosities had to be stifled with threats to avoid danger against bandits and neighboring villages. They took up sheep, and their doctrine as early as genesis says the land is human property given to them by god to exploit. This justifies hunting off wolves, and raising sheep, despite it promoting dry-lands. Now look at the middle-east, does it look fertile to you? Thats the result of your 'purpose', to procreate, dominate, and consume regardless for the consequences.
Just for one example that I am not pulling it out of my ass.
Source: Life was just an accident?