Mundaka Upanishad:~ The Sages ignored these rituals and went in search of higher knowledge.+

Bhagavad Gita Chapter:~ All those whose intelligence has been stolen by material desires, they worship many Gods. (7- Verse -20)

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

When Bhagavad Gita says, God is considered the all-pervading consciousness which is the basis of all the animate and inanimate entities and material then nothing has to be accepted as God  other than consciousness. 

Even Brihadaranyaka Upanishad: ~ Brahman (God) is present in the form of the Athma, and it is indeed Athma itself.

Even Rig Veda: ~ The Atman (Spirit) 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)

Yajurveda – chapter- 32:~     God is Supreme Spirit.

Vedas and Upanishad confirm the Soul, the Self God. The Soul is present in the form of the Spirit or consciousness.

God (Spirit) is not separate from the universe (matter) because God (Spirit) and the universe (matter) are one, in essence. Without God, the universes in which you exist cease to exist. God is the fullness of the Spirit. Thus, any division in the Spirit, as the form, time and space is merely an illusion. Thus, the universe in which you exist is merely an illusion created out of the Spirit, which is God in truth.

The atheists and religious people, both are believers. The atheists believe there is no such thing as God and religious people believe there is God. Belief is not the truth. One must know God in truth. The truth will set the Spirit free from the illusory prison of form, time, and space.

Remember:~

Religious people are unaware of the fact that there is no God that can exist, apart from the Soul, the innermost ‘Self’. The Soul is present in the form of consciousness. If there is no consciousness, then there is no physical body, no world, and no Gods based on blind belief.

Yajur Veda says:~  "They are enveloped in darkness, in other words, are steeped in ignorance and sunk in the greatest depths of misery who worship the uncreated, eternal prakrti -- the material cause of the world -- in place of the All-pervading God, But those who worship visible things born of the prakrti, such as the earth, trees, bodies (human and the like) in place of God are enveloped in still greater darkness, in other words, they are extremely foolish, fall into an awful hell of pain and sorrow, and suffer terribly for a long time.

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.

How can you worship the Absolute? That implies two ~ the worshipper and the worshipped, whereas the Absolute is nondual. One can worship his idea of the Absolute only or realize his unity with it when he can’t worship it as apart.

Religious rites and rigid ceremonies were passed down from one generation to the next as a practice or set customs and tradition and performed automatically with blind faith. Such worship based on the belief of God does not reach God.

Religious rites and ceremonies, yagnas and homa-havans, or any other forms of ritual are meant for the ignorant populace.

Belief in God without knowing God in actuality holds the worshiper more firmly in the grip of ignorance. 

All worship and the ceremonies rituals performed on the base of non-Vedic Gods will not yield any fruits.  Deeper self-search reveals the fact that worshiped, the worship and worshiper, and the world are merely an illusion created out of consciousness.

Religious rites and ceremonies, yagnas and homa-havans, or any other forms of rituals formal observance have long since set in. 

Religious rites and ceremonies, yagnas and homa-havans, or any other forms of ritual are meant for the ignorant populace. In the Atmic path, the seeker has to discard what is not needed to realize the truth, which is beyond the form, time, and space.

Religious rites and ceremonies, yagnas and homa-havans, or any other forms of rituals formal observance have long since set in. 

Sage Sankara says ~ “The scriptures dealing with rituals, rewards are therefore addressed to an ignorant person.  

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. Sage 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 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. :~Santthosh Kumaar