Deeper understanding is necessary to understand and assimilate the truth about Gods existence to know what is supposed to be the God.

Pursuit of truth is all about accepting uncertainty and open questions and seeking for the things that are certainty. Believers and nonbelievers   will not accept anything other than their inherited belief system or accepted truth.  Atheists feel there is no proof for god’s existence. So the atheist chooses to just believe there is no such thing called God. And the religionists just believe in the existence of their conceptual god.  A Gnani is one who is fully aware of the fact that, the existence or non-existence of God cannot be proven on the base of the physical self.  Therefore Deeper understanding is necessary to understand and assimilate the truth about Gods existence to know what is supposed to be the God.

In Vedas the God has been described as:-

  Sakshi (Witness)

  Chetan (conscious)

  Nirguna (Without form and properties).

  Nitya (eternal)

  Shuddha (pure)

  Buddha (omniscient)

   Mukta (unattached).

All these above descriptions of god is of the soul,which is present in the form of consciousness. The consciousness pervades in everything and everywhere in  all the three states.  Thus, the soul or consciousness is ultimate truth or Brahman.   

It means the ultimate truth is God.  That is Atman is Brahman.  That is the true self is ultimate truth.

In Advaita Vedanta: - Brahman is without attributes and strictly impersonal. It can be best described as infinite Being, infinite Consciousness and infinite Bliss. It is pure knowledge itself, similar to a source of infinite radiance. Since the Advaitins regard Brahman to be the Ultimate Truth, so in comparison to Brahman, every other thing, including the material world, its distinctness, the individuality of the living creatures and even Ishvara (the Supreme Lord) itself are all untrue. Brahman is the effulgent cause of everything that exists and can possibly exist. Since it is beyond human comprehension, it is without any attributes, for assigning attributes to it would be distorting the true nature of Brahman. Advaitins believe in the existence of both Saguna Brahman and Nirguna Brahman; however they consider Nirguna Brahman to be the absolute supreme truth. 

Atman is the true self.   The true self or Atman is in the form of consciousness is ultimate truth and it is God.  

The Atman is within the mind (universe) and mind (universe) is within the soul. The universe) is within the self and self is within the universe. The chicken is in the egg and the egg is in the chicken. The tree is in the seed and the seed is in the tree. The same thing that was told by the Vedas was repeated by the Saint John (10-38)? Father is in me and I am in the Father. Thus the father (soul)is our immediate, neighbor- love thy neighbor.  Therefore, one has to love the soul in order to become one with the formless spirit/soul/ Christ, which are the creator, sustainer and dissolver of the world/duality.  

Therefore, self-realization is necessary in order to realize the ultimate truth or God.  Self-realization is real God realization.