Bhagavan Buddha rejected the scriptures, and even Sage Sri, Sankara indicated that the ultimate truth lies beyond religion, concept of God and scriptures.++****.

Bhagavad Buddha said: ~ Buddha's nature is not a man, but a state. I have found the way. Enter all of you!

Self-knowledge cannot be attained by the study of the scriptures and intellectual understanding or by bookish knowledge.  Therefore, there is no use of studying the scriptures and other scriptures in order to acquire the non-dual wisdom.  

That is why Bhagavan Buddha rejected the scriptures, and even Sage Sri, Sankara indicated that the ultimate truth lies beyond religion, the concept of God, and scriptures.

There is only one Reality to be known, the same for all seekers, but the ways to it, are hidden by the religion.  Self-discovery is the only way, towards non-dualistic absolute without any religious doctrines, which will help the seekers to unfold the mystery of the illusion in which we all are searching the truth of our true existence.

An essential identity between Atman and Brahman is upheld in Advaita Vedanta. The personality of Sage Sri, Sankara, and the force of Advaita wisdom is so strong that most post-Sage Sankarian schools of Vedanta consciously define their doctrines against Advaita thought.

When Sage Sri, Sankara declares Atman and Brahman, then the direct realization of truth is possible without the scriptures. Know the soul to be the true self. The soul, the innermost self is present in the form of consciousness. And realize the consciousness as the ultimate truth or Brahman.

Self-Knowledge is the aim of every human being. Since everyone thinks the physical body is the self their aim is misdirected and they focus their attention on materiality which makes one feel the duality (waking) as a reality.

Therefore, there is no need to study the scriptures, or indulge in god and guru glorification or performing religious rituals. Since they are not the means to acquire non-dual wisdom. It is only a waste of time and effort to indulge in those things.

That is why Sage Sri Sankara says:~ VC~59. The study of the Scriptures is useless so long as the highest Truth is unknown, and it is equally useless when the highest Truth has already been known.

60. The Scriptures, consisting of many words are a dense forest that merely causes the mind to ramble. Hence,  men of wisdom should earnestly set about knowing the true nature of the Self.

61. For one who has been bitten by the serpent of Ignorance, the only remedy is the knowledge of Brahman. Of what avail are the Vedas and (other) Scriptures, Mantras (sacred formulae), and medicines to such a one?

62. A disease does not leave off if one simply utters the name of the medicine, without taking it; (similarly) without direct realization one cannot be liberated by the mere utterance of the word Brahman.

63. Without causing the objective universe to vanish and without knowing the truth of the Self, how is one to achieve Liberation by the mere utterance of the word Brahman? — It would result merely in an effort of speech.

 Advaita (non-duality) and Dwaita (duality) is a state of the Self. It is not some intellectual theory. The Orthodox Advaitins believe the Atman (Soul) is Brahman, and the world is an illusion. 

The Orthodox Dwaitins believes the body as self, and they believe the world is a reality, and they believe in creator and creation theory. In India Advaita and Dwaita is mere a religious tradition, which they inherited from their ancestors. No one questions their validity because it is considered blasphemy to question any guru and god-men or pundits.

People who are attached to their religious code of conduct and trying to preach Advaita, that is mixing the individual life, and the concept of God, and all mixed up hotchpotch religious doctrine and feed the seeking minds, are themselves not aware of the fact that the individuality  and the worldly life is part of the illusion and it is nothing to do with the ultimate truth or Brahman

Bhagavan Buddha must have verified religion, the Vedas, and the concept of God and found them inadequate and useless in the pursuit of truth and rejected them. 
Bhagavan Buddha got enlightened without the aid of the religion, the Vedas, and the concept of God.

After studying and going through all the rigorous training from the religious scholars in Theosophical Society, J.K was confused about all these, and when he started verifying with deeper introspection, he found everything was priest-crafted hotchpotch ideologies. Thus, he refused to become the world guru, rejected it, and walked out and condemned the priestcraft.:~Santthosh Kumaar