Some call it physics
Yup, some how people had to explain the unexplained. The also had to come down from the mountain top with a set of rules that were needed so the people in one's tribe or village could live together in reasonable harmony.
Actually, IMHO, the students of the seer just became the professional religious class.
Years removed from the original seer who became freed of concepts, his utterances became codified and worshipped.
(definitely not his intention, but a last gasp effort by ignorant followers to preserve his message, and possibly a living, and a way of life)
So aptly put by you, the “professional religious class.”
The teachings during the seer’s lifetime were more so methods and practices, not blind worship and ritual, and never termed “religion.”
The seer’s methods and practices did involve rules and codes of conduct to accomplish certain ends, that being the art of seeing clearly the universe, devoid of concepts which alter perception.
The disciplines used in religions, are not unlike rules in any other organization focused on achieving a goal.
Imagine a military without rules and discipline. Or, for that matter, imagine running a McDonalds or a sports franchise without rules and disciplines.
Some form of structure had to be established by the seer in order to house and guide his students who choose to follow without coercion.
The only problem with religion is that the rules and disciplines were misused by selfish, devious minds, no longer aimed at the goal of transitioning from an imposed disciplined mind, to the arrival at the unfettered mind of a seer. Instead, the rules were redirected to maintain patronage, allegiance and dedication to the religious organization’s health, profits and growth.
True religions by true seers were only a means to an end. The seers were not corrupt. Their survivors were good businessmen and skilled in the art of cunningly using religion to promise people eternal happiness in exchange for enrollment and membership.
If you read the works of any great sage or seer, you will see how simple, practical and non-religious they really are.
When a teaching is extremely aged, translated from its original language and culture, there is bound to be confusion, mistranslation, and misunderstanding.
Foreign works are never a direct translation. They are subjected to interpretation. To quote them exactly is a recipe for disaster.
A completely free and unfettered mind, devoid of concepts, is the most powerful instrument for understanding the universe. Well beyond the man-made sciences and technology.
All science and technology is a compensation needed by a mind still bound to concepts, beliefs, and habits of perception.