First, you must know what God is supposed to be in actuality.+

People all over the world in the past and present accepted the idea of the existence of God. The fear of God injected by religion was the root cause of worship, superstitions, and dogmas. The religious belief is passed on to the populace from one generation to the next generation.

The religion preaches that God is one and the ways to God are many. It simply tries to lead them to darkness with its dogma and idea of many Gods, which is apart from the Self.

First, you must know what God is supposed to be in actuality. You must know the God which you believe and worship are not God in truth according to your own scripture.

God cannot be seen directly by anyone. God pervades everything and everywhere in the universe.

There is a clear-cut idea in the scriptures, what is supposed to be God. And what not to worship in place of God in truth then why worship Gods based on blind faith or blind belief, which is not God in truth.

Why worship personal Gods when Sage Sankara says God is impersonal.

Sage Sankara’s Supreme Brahman is impersonal, Nirguna (without Gunas or attributes), Nirakara (formless), Nirvisesha (without special characteristics), immutable, eternal, and Akarta (non-agent). It is above all needs and desires. It is always the Witnessing Subject. It can never become an object as It is beyond the reach of the senses. Brahman is non-dual, one without a second. It has no other besides it. It is destitute of difference, either external or internal. Brahman cannot be described because description implies a distinction. Brahman cannot be distinguished from any other than It. In Brahman, there is not distinction between substance and attribute. Sat-Chit-Ananda constitutes the very essence or Svarupa of Brahman and not just Its attributes. The Nirguna Brahman of Sage Sankara is impersonal. 

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

Bhagavad Gita: ~ Brahmano hi pratisthaham ~ Brahman (God in truth) 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.

Lord Krishna says Ch ~V: ~ “Those who know the Self is in truth.". The last two words (tattvataha) are usually ignored by pundits, but they make all the difference between the ordinary concept of God and the truth about God.

The dualistic worship of "God” is only for the ignorant populace. God in truth is only Atman, the ‘Self’. In reality, there is no duality, no differentiation. Only Atman exists.

Thus, by sticking up to the Gods, which are not God in truth, you are sticking up to the illusion. Sticking up to illusion means sticking up to ignorance. sticking up to ignorance means you are not qualified to acquire self-knowledge or Brahma Gnana or Atma Gnana.

Remember:~

Rig Veda: ~ 'Prajnanam Brahma'- Consciousness is the ultimate reality or Brahman or God in truth.

Do not accept any other God other than the Soul. The Soul is God in truth, Nothing is real but the Soul, which is present in the form of consciousness. Nothing matters but realizing God in truth. God in truth is everywhere and in everything. Let these words be inscribed in your subconscious.

God in truth is hidden by the illusory universe. God in truth alone is real and eternal and all else is an illusion.:

Brahman is merely a word to indicate the ultimate truth or God in truth. The ultimate truth itself is God in truth.

Remember even Vedas bar worshipping Gods which are not God in truth:~

Yajur Veda says: ~

Translation 1

They enter darkness, those who worship natural things (for example air, water, sun, moon, animals, fire, stone, etc).

They sink deeper into the darkness than those who worship sambhuti. (Sambhuti means created things, for example, table, chair, idol, etc.) (Yajurveda 40:9)

Translation 2

Deep into the shade of blinding gloom fall asambhuti's worshippers. They sink to darkness deeper yet who on sambhuti is intent." (Yajurveda Samhita by Ralph T. H. Griffith pg 538)

Translation 3

"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." (Yajurveda 40:9.)

So, Yajur Veda indicates that: ~

They sink deeper into the darkness than those who worship sambhuti. (Sambhuti means created things, for example, table, chair, idol, etc. (Yajurveda 40:9)

Those who worship visible things born of the prakrti, such as the earth, trees, and 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." (Yajurveda 40:9.)

To acquire Self-knowledge or Brahma Gnana or Atma Gnana, the seeker has to realize his inherited religion is adulterated in the past and it becomes a great obstacle is realizing the ultimate truth or Brahman or God in truth.

The seeker's aim is the search for the Ultimate Truth or Brahman. The search to find the non-dualistic or Advaitic truth that in actuality never was lost, only hidden by ignorance.::~Santthosh Kumaar