Monotheism and polytheism both are religious concepts.+

Monotheism and polytheism both are religious concepts.  Monotheism is the belief in a single God. Polytheism is the belief in multiple Gods. Monotheism and polytheism are based on blind faith or blind belief.

 God in truth is not based on blind faith or blind belief.

To realize  God what is supposed to be in truth Advaitic wisdom of Sage Sankara is very much necessary. 

The mystery of God is hidden by the universe, which is the dualistic illusion or Maya. God is one, which is the cause of the universe. The whole universe is created out of the Spirit, which is God in truth. There is no duality in the nature of God in truth, which is the Spirit. 

Oneness is the nature of the Spirit, the God in truth.  The universe becomes an illusion when you realize God in truth.

When you realize God in truth then the illusory nature of the universe is exposed.

Like an ornament made from gold is Gold, that which is born out of Spirit is Spirt. Like gold is a permanent thing, in ornaments made of gold, similarly, the universe is born out of Spirit, which is Spirit in its essence.

The Spirit is the ultimate truth or Brahman or  God in truth. God in truth neither comes nor goes, but God in truth exists eternally. The universe, which appears as disappears is merely an illusion. 

Thus, all the form-based Gods are merely an illusion. God is the cause of the universe, and God is causeless.

Why worship God based on the illusory form, time, and space, Self-realization is God- realization, and God-realization itself is the real worship.

People in India believed in polytheism, believing all of their Gods to be separate individuals, which was introduced much later by the founders of Hinduism which contains diverse beliefs caste, and creed.

The Vedas bar polytheism thus, it proves that  Hinduism believes in polytheism is not ancient Vedic Religion or Santana Dharma.

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

Rig-Veda 1.164-46 and Y.V 32-1 clearly mention that God is “One”.

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

Rig Veda: 1.164.46: ~ Ekam Sat Vipra Bahudha Vadanti” -” The Reality (Truth or God) is One.

Rig Veda 1/164/46: ~ “They call him Indra, Mitra, Varuna, Agni, or the heavenly sunbird Garutmat. The seers call in many ways that which is One; they speak of Agni, Yama, Matarishvan.

Rig Veda 8/58/2: ~ Only One is the Fire, enkindled in numerous ways; only One is the Sun, pervading this whole universe; only One is the Dawn, illuminating all things. In very truth, the One has become the whole world.

The Upanishads say in effect that: ~If you believe that you are one and God is another you cannot understand Truth.

Religious Gods are based on blind belief.  Gods based on blind belief cannot be considered as the center because, the Soul, the  ‘Self’ is the center of all that exists. Without the Soul, the world in which you exist ceases to exist, which means the religious God is dependent on the Soul for his existence.

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

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. 

Rig Veda: ~ The Atman 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)

Rig Veda says God is ‘ONE’ and God is Atman, then why believe and worship in place of the real God.

Maitreyi Upanishad 2:26 says: ~ All those who desire to have salvation without taking several births, should worship God in spirit and truth.

ISH Upanishads: ~By Worshiping Gods and Goddesses you will go after death to the world of Gods and Goddesses. But will that help you? The time you spent there is wasted because if you were not there you could have spent that time moving forward towards Self-knowledge, which is your goal. In the world of Gods and Goddesses, you cannot do that, and thus you go deeper and deeper into darkness.

It clearly indicates that: ~If the human goal is to acquire Self-Knowledge or Brahma Gnana or Athma Gnana then why indulge in rituals and glorify the conceptual Gods, Goddesses, and gurus to go into deeper darkness. Instead spend that time moving forward towards Self-knowledge, which is one’s prime goal.

Upanishads: ~ They alone in this world are endowed with the highest wisdom who are firm in their conviction of the sameness and birthlessness of Atman. The ordinary man does not understand their way. (Chapter IV — Alatasanti Prakarana 95-P-188 in Upanishads by Nikilanada)

Sage Sankara’s Supreme Brahman (God) 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 no 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.

Brihadaranyaka Upanishad declares:~ "He who worships the deities as entities entirely separate from him does not know the truth. For the Gods, he is like a pasu (beast)”. (1.4.10)

That is why Sage Sankara:~ VC~.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?

Sickness is not cured by saying the word “medicine.” You must take the medicine. Ignorance will not vanish does not come by merely saying the word “God nor by worshiping God of belief. First one must know what God is supposed to be. God must be realized. One must know God in truth.

Perfect undemanding and assimilation of ‘what is what’ leads to truth realization, truth realization itself is Self-realization. Self-realization itself is God-realization. God- realization itself is real worship. : ~ Santthosh Kumaar