There could be other reasons for polytheism
Look at the evolution of religion in human history. Initially, it was spiritualistic, with the various domains of daily life being controlled by one agent or another, often viewed as animals. This was before man had a concept of intelligence, and was still unable to dominate these animals. They were seen as man's superior because they were faster, stronger, could fly, etc., and the animals were worshiped and honored.
As man came to see himself as equal or superior to the beasts, the animal pantheons became half human - centaurs, minotaurs, Anubis, Horis, etc..
Then these became humanlike pantheons as with the Greeks and Vikings, followed by monotheism with manlike gods ruling the cosmos, then deism, and finally, atheism.
But as with biological evolution, the advent of new forms doesn't mean that the ancestral forms have disappeared. There are still polytheistic religions. I believe the Druids are one. And there are still monotheists and deists.
“The first principle Baha’u’llah urged was the independent investigation of truth. “Each individual,” He said, “is following the faith of his ancestors who themselves are lost in the maze of tradition. Reality is steeped in dogmas and doctrines. If each investigate for himself, he will find that Reality is one; does not admit of multiplicity; is not divisible. All will find the same foundation and all will be at peace.” –
Abdu’l-Baha,
Star of the West, Volume 3, p. 5.
I would agree with this apart from following the path of my ancestors, or that I am lost in a maze, unless that only refers to childhood.
But yes, we are well advised to each determine what we consider knowledge ourselves if we have the skills to do that. That requires skill in critical thinking and exposure to a variety of ideas.
But that's not religion. I was in a religion for ten years through my twenties - Protestant Christianity. Critical thinking and looking outside the faith for guidance were discouraged. It wasn't until I left religion that I began to consider other ideas, and after about five years of exploration, I settled on a worldview that I later learned was called secular humanism, or basically, a godless metaphysics with a rational ethics and epistemology, the natural final position for anybody recognizing the problem with faith-based thinking and systematically trying to eliminate it from one's way of deciding what is true about the world. I don't limit this to religious belief like creationism. If you think that the last American election was rigged, that the coronavirus is a hoax or a conspiracy, that the earth is flat, that man never went to the moon, that climate change is a hoax, etc., then you are engaging in faith-based thinking as well
So, I agree with your source, but I never consulted it to come to that conclusion.
Who and what do you follow?
Nobody but my own faculties of reason and conscience.
There can be only one or two humans who knows the truth on earth
Nah. There's millions, if by truth you mean the ideas that accurately allow one to predict and perhaps control outcomes. Skepticism and reason properly applied to the relevant evidence is the path to truth. It does not involve believing any spiritual leader, prophet, guru, or messenger. We make these discoveries individually and empirically, judging the truth-value of an idea by its ability to help us produce desired outcomes and escape pitfalls.
I consider myself more qualified to give life advice than most of the people offering it unsolicited to me and others, but I don't do it because it's arrogant and impolite, like correcting somebody's grammatical mistake. In fact, if people came to me for such answers, I would be like Monty Python's Brian or Forrest Gump, unwillingly pursued by throngs of devotees. My answer would be to go find your own truth, which you'll never do looking for somebody to follow.
it's not healthy to be without a leader of guidance from God for that reason.
I consider it unhealthy to submit oneself to another's ism. People in the religions don't seem to have any extra answers - just beliefs that they remain dependent upon, beliefs they would have outgrown had they matured outside of religion, and which do nothing for them except continue to comfort them in ways the unbeliever doesn't need. I'm perfectly content with the idea that I may not have an afterlife and that there might be no god. What does religion have to offer a mature secular humanist?
When believers tell me how much their religion helps them, I think of a person who needs glasses to read and tells me how great glasses are. I think it's great that people who need religion or glasses have them, but I prefer to not need either.