Advaitic Gnana means Self-knowledge or Brahma Gnana or Atma Gnana.+

Sage Sankara’s Advaitic wisdom is the fairest flower of wisdom in the world. Sage  Sankara says   Talk as much philosophy as you like, worship as many Gods as you please, observe ceremonies, and sing devotional hymns, but liberation will never come, even after a hundred aeons, without realizing the Oneness.

Advaita is not philosophy. Advaita is the ultimate truth or Brahman or God.   The nature of God is Advaita.  All the teachings propagated by some gurus are adulterated with theories, tradition, and religion, which are not Advaitic wisdom. 

Advaitic Gnana itself is Self-knowledge or Brahma Gnana or Atma Gnana.
Lord Krishna confesses that the oldest wisdom of India (Advaitic wisdom) has been lost: people misinterpret and falsify it today as they did then. It is not yoga but the philosophic truth. But nobody knows it. The teachers of philosophy and leaders of mysticism or religion do not want to inquire into the truth and have no time for it. (Gita –Chap- IV-v.2)

Advaitic reality there is neither God nor Goddess but only the consciousness. Consciousness is the real God.

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. (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 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. The God in truth is only Atman, the Self.   In reality, there is no duality, no differentiation. Only Atman exists.

The Vedas confirm God is Atman (spirit), the Self.

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 1-164-46 and Y.V 32-1 clearly mention that God is “One”.

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

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.

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

Meher Baba said: ~   God is your innermost Self. Do not search for God outside of you.  Let these words be inscribed in your heart. Nothing is real but God. Nothing Matters but love for God. God is everywhere and does everything. God is beyond us and is everything.  God alone is and all else is an illusion.

People who are saying ‘I AM GOD’ are hallucinating that they become God. First, you must know what God is supposed to be in actuality.

Sage Sankara declares Atman is Brahman. That is the Soul, which is present in the form of consciousness is the ultimate truth and the ultimate truth or Brahman is God.

The nature of God is Advaita. Advaita is the fullness of consciousness. God is present in the form of the Atman, therefore; never accepts another God in place of the Atman nor worship other than the Atman.

Thus, truth realization is Self-realization. Self-realization is God-realization. God-realization itself is real worship.:~Santthosh Kumaar