The knowledge or Spirit is Self-knowledge or Brahma Gnana or Atma Gnana.+

The religious Gurus are only a knower of the religious doctrines, not a knower of the ultimate truth or Brahman or God.  The Knower of the ultimate truth or Brahman or God is Brahma Gnani. 

A Brahma Gnani has realized the knowledge beyond form, time, and space. Religion is nothing to do with Spirituality. Spirituality is the knowledge of the Spirit, which is beyond form, time, and space. The knowledge or Spirit is Self-knowledge or Brahma Gnana or Atma Gnana.  

Hinduism indulges non-Vedic beliefs such as idolatry, ancestor worship, pilgrimages, priestcraft, offerings made in temples, the caste system, untouchability, and child marriages. All these lack Vedic sanctions, therefore, Hinduism is not Ancient Vedic religion or Santana Dharma.

All Hindu Gods are not Vedic God. The Vedas exclaim from time immemorial: ~

Yajurveda – chapter- 32:~,    God is Supreme Spirit has no ‘Pratima’ (idol) or material shape. God cannot be seen directly by anyone. God pervades all beings and all directions. Thus,   Idolatry does not find any support from the Vedas.

The Vedas exclaim from time immemorial: ~              

 Rig Veda, 1-164-146 :~ Ekam Sat Vipra Bahudha Vadanti, ~  Existence is One 

God is one and universal.

God is the Spirit.  The Spirit is the Soul, the innermost Self.  God is the Soul, the  Self.  The Soul is the Supreme Being the One eternal homogeneous essence, indivisible consciousness, and intelligence, which is beyond form, time, and space.   To which the Sages describe in a variety of ways through diverse words.

Rig  Veda: ~ The Atman (Soul) is the cause; Atman is the support of all that exists in this universe. May ye never turn away from the Atman, the Self. May ye never accept another God in place of the Atman nor worship other than the Atman?" (10:48, 5)

Bhagavad Gita: ~ Brahmano hi pratisthaham Brahman (God) is considered the all-pervading consciousness which is the basis of all the animate and inanimate entities and material (Gita 14.27)

Upanishads say in effect that: ~ if you believe that the Soul is one and God (Brahman) is another you cannot understand Truth.

Brihad Upanishad: ~ “If you think there is another entity, whether man or God there is no truth."

     Religion advocates extreme asceticism. Asceticism is a waste of time. Religion is nothing but remaining in false beliefs, dogmas, and superstitions.  

Mundaka Upanishad:~  The rituals and the sacrifices described in the Vedas deal with lower knowledge. The sages ignored these rituals and went in search of higher knowledge. ... Such rituals are unsafe rafts for crossing the sea of samsara, of birth and death. Doomed to shipwreck are those who try to cross the sea of samsara on these poor rafts. Ignorant of their own ignorance, yet wise In their own esteem, these deluded men Proud of their vain learning go round and round Like the blind led by the blind.

Sage Sankara says:~ The scriptures dealing with rituals, rewards are therefore addressed to an ignorant person. Thus, the rituals are meant for ignorant people.

Sage Sankara: ~ "Though I wear these robes of a Sanyasin, it is only for the sake of bread."

~ This shows he was wearing the religious robe only for the sake of bread." Thus, it means those,  who are wearing the religious robe for the sake of bread.

All the rituals based on the false belief of Gods will not yield any fruits and they are meant for the ignorant populace who are unable to grasp the God beyond the form, time, and space.

One of Sage Sankara’s missions was to wean people away from a ritualistic approach advocated by Mimamsakas and to project wisdom (jnana) as the means of liberation in the light of Upanishad teachings.

Sage Sankara criticized severely the ritualistic attitude and those who advocated such practices. However, the Orthodox texts that combined rituals with wisdom (jnana_karma_samucchaya) more in favor of the Mimamsaka position came into vogue, projecting Sage Sankara as the rallying force of the doctrine. 

Sage Sankara:~ (11) As regards the rituals, Sage Sankara says, the person who performs rituals and aspires for rewards will view himself in terms of the caste into which he is born, his age, the stage of his life, his standing in society, etc. In addition, he is required to perform rituals all through his life. However, the 'Self' has none of those attributes or tags. Hence, the person who superimposes all those attributes on the changeless, eternal Self and identifies Self with the body is confusing one for the other; and is,  therefore,  an ignorant person. The scriptures dealing with rituals, rewards, etc. are therefore addressed to an ignorant person. -Adhyasa Bhashya 

Sage Sankara:~ (11.1) This ignorance (mistaking the body for Self) brings in its wake a desire for the well-being of the body, aversion for its disease or discomfort, fear of its destruction, and thus a host of miseries(anartha). This anartha is caused by projecting karthvya (“doer” sense) and bhokthavya (object) on the Atman. Sankara calls this Adhyasa. The scriptures dealing with rituals, rewards, etc. are,  therefore, he says, addressed to an ignorant person.-Adhyasa Bhashya 

Sage Sankara:~ (11.2) In short, a person who engages in rituals with the notion “I am an agent, doer, thinker”, according to Sage Sankara, is ignorant, as his behavior implies a distinct, separate doer/agent/knower; and an object that is to be done/achieved/known. That duality is avidya, an error that can be removed by Vidya.-Adhyasa Bhashya 

Sage Sankara: ~ (12) Sage Sankara affirming his belief in one eternal unchanging reality (Brahman) and the illusion of plurality, drives home the point that Upanishads deal not with rituals but with the knowledge of the Absolute (Brahma Vidya) and the Upanishads give us an insight into the essential nature of the Self which is identical with the Absolute, the Brahman.-Adhyasa Bhashya 

Sage Sankara: ~ Atman, the innermost Self is verily Brahman (God), being equanimous, quiescent, and by nature absolute Existence, Knowledge, and Bliss. Atman is not the body that is non-existence itself. This is called true Knowledge by the wise. 

Realizing the universe is created out of single stuff and that single stuff is the Soul which is present in the form of consciousness leads to non-dualistic or Advaitic Self-awareness. Self-awareness is freedom or Moksha. Moksha is unity in diversity in the midst of the dualistic illusion.:~Santthosh Kumaar