The scholars all the time were aware that the Upanishads could not be linked with the Vedas. Upanishads always represented the ancient religion that was originated from Tantras (or Agamas) and mostly were based on the Sankhya Darshana. The early Upanishads emerged to protest Vedicism on philosophical grounds in the regions of North India, especially Videha kingdom, where Vedic religion had found some space to begin with. The people, enchanted by the Vedicism and its elaborate fire sacrifices, had started converting to that religion. To stop the people from moving into the Vedic camp the scholars through the Upanishads started attacking the fallacy of that religion which had no sound philosophical structure or logical ritualistic base.
The distinction was always clear as the Upanishads were always called “Vedanta”, end of the Vedas or end of the Vedic doctrine. But the impression was created later that the Vedanta meant “ending portions of the Vedas”. They changed the meaning so deceitfully that the people over the time forgot that Upanishads were part of their own ancient tradition that strongly had opposed the Vedic religion.
“If it be granted that the true derivation of the word ' Upanishad ' is what is suggested by Prof. Max Muller, then it would be one piece of evidence to show that the common belief of the Hindus is wrong and that the subject matter of the Vedas and the Upanishads are not complimentary but antagonistic. That the system of thought embodied in the Upanishads is repugnant to that of the Vedas is beyond doubt” so rightly had observed Dr. Babasaheb Ambedkar in his ‘Riddles in Hinduism”.
Upanishads too are not free from the interpolations, misinterpretations and fabricated history. Vedics had been masters of such malpractices and continue to be so in modern times as well. Many Vedic scripts were written in later course following the style of the original Upanishads to obscure the original doctrine of the ancient Upanishads. However the attempts failed as they never could reach the philosophical heights of the original tradition. The philosophy of the anti-Vedic Upanishads is so much so clear that a layman also can easily identify its true essence. The Upanishads succeeded in restricting the spread of Vedicism in the ancient times. Vedics had to move to Magadh region to find new patrons. The way Buddha and his philosophy too was attempted to hijack, the Upanishads were not exception. Vedic religion could spread its charm in India it was because of their sheer malpractices. The Vedas were declared infallible and originated directly from the God. Vedas were given divine status and were propagated everywhere applying all the possible means. These were of course mesmerizing practices those helped them to establish supremacy of the Vedas and hence the Vedics though very few could understand the meaning of the Vedic verses.
Almost every scholar, even non-Vedic too, of the past started declaring his work had Vedic sanction, no matter even if his writing was against the tenets of the Vedas. There are many texts those claim being based on the Vedic teachings when we cannot trace anything of that sort in the Vedas. This practice emerged only because the writers too sought respect in the royal courts where Vedics had already established their supremacy!
Hindu religion, though in practice from pre-Vedic era, having its own philosophy and rituals, gradually got shadowed by the Vedic dominance that was attained by the immoral means. Though the common Hindu people followed their ancient religion which was nowhere remotely connected with the Vedas, they too nourished the threat of the Vedas.
There was small percentage of the people who read, recited the Vedas and followed the Vedic doctrine in their day to day life. The Vedic rites were all the time were reserved for them. They had closed their doors soon after Gupta era to disallow any entry in their religion by conversion which prior to that was a normal practice in the Vedic religion. In social practice Vedic religion always remained independent and self governed. What they did was more disastrous, they stole the cultural ethos of the Agamic (Hindu) people.
By deliberate misinterpretation of the term “Vedanta” they took hold of the Upanishads and other ancient philosophy too.The explanations given by the modern Vedic scholars, including Tarkateertha Laxmanshastri Joshi, about the anti-Vedic elements in most of the Vedanta literature were lame and face savers. They said it was reactionary movement of the Kshatriya's to overthrow the yoke of the Brahmanical supremacy. They tried to portray that it was the internal struggle of the Vedics. But Upanishads do not support this claim. Sankhya Darshan too refutes this claim.
We can see it clearly that the term “Kshatriya” originates from original ‘Khatiya, land owner which has completely different connotation and has nothing to do with the Sanskritized term Kshatriya. Also, Kshatriya never was second ranking class in Vedic social order but Rajanya. The same applies to the word “Brahma” which has two different meanings in two different cultures. One, in Vedic context, Brahma means verse and second, in Upanishadic context, “Brahma” means omnipotent principle. Upanishads Brahma is very close in meaning with the Yaksha and is found being used alternatively to represent the same supreme element. The most revered 'Om' too originates from the Upanishads, nowhere to be found in the Vedic literature, because Upanishads do not belong at all with the Vedas. The linguistic similarities were later on misrepresented to show the Vedic origin of everything! However, knowingly they never tried to explain the drastic change in the meaning in parallel scenarios.
As Dr. Ambedkar states, Vedas and Upanishads are antagonistic to each other in the subject having nothing in common. Upanishads belong to the ancient Tantra (Agamic) tradition of the Hindus. Upanishads were meant to create first systematic philosophical resistance in the spread of the Vedic religion and succeeded too to some extent. Gradually, with mischievous efforts, Vedics took charge of that philosophical tradition and portrayed it being Vedic when it was not!
Adim Hindu Parishad is determined to remove Vedic elements from the Hindu religion while reclaiming its obscured heritage to purify Hindu religion!