Nirguna and Saguna are classified only in duality. In non-dual reality there is neither the nirguna nor the saguna, everything is one.+

Nirguna Brahman is nothing to do with religion because nirguna Brahman is Atman, the God in truth is not the God people believe and worship.

Nirguna Brahman (God in truth) of Sage Sankara 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 the description implies distinction.

Brahman cannot be distinguished from any other than It. In Brahman, there is not a distinction between substance and attribute.

Sat-Chit-Ananda constitutes the very essence or Svarupa of Brahman and not just Its attributes.

Remember:~

Nirguna (attributeless) is the nature of the Soul, the Self. The Saguna (attributed) is the nature of the mind, which is present in the form of the universe.

The Soul is the knower of the Saguna (mind). The Saguna (mind or the universe) is merely an illusion, from the standpoint of the nirguna, which is the Soul, the Self. Thus, the Saguna (mind or world) is a myth from the standpoint of the nirguna, which is the Soul, the Self.

The Soul is the real Self and eternal identity. The nirguna (Soul) can remain with or without the Saguna (mind) whereas the Saguna (mind) is dependent on Nirguna (Soul) for its existence

Nirguna and Saguna are classified only in duality. In non-dual reality there is neither the nirguna nor the saguna, everything is one. Therefore, the nirguna and the Saguna are one, in essence, that is Soul, which is present in the form of consciousness.

The Saguna is the mind because when the mind is present then all the attributes are present, and when the mind is absent then the attributes are absent.

The Samadhi is the natural state of the Soul, the Self. In the natural state, the attributes are non-existent and in duality ( the mind), all the attributes are present. Thus, duality and nonduality are the nature of the Soul, the Self. The duality and the nonduality are not some theories. The theoretical duality and nonduality is nothing to do with the ultimate truth or Brahman or God in truth.

The world in which we exist is present in the form of objective awareness. The whole objective awareness is created out of single stuff. That single stuff is the Soul, which is present in the form of consciousness. The knowledge of the single stuff is Self -knowledge or Brahma Gnana or Atma Gnana.

The dual (waking or dream) and nondual (deep sleep) experiences appear and disappear. The Soul is the witness of the coming and going, of the three states.

All three states are made of single stuff. That single stuff is the Soul, which is present in the form of consciousness.

Thus, the single stuff alone is real and eternal and the entire three states are merely an illusion created out of the Single stuff.

Realization of the single stuff, which is the Soul, which is present in the form of the consciousness is Self -realization.

Till ignorance is there the three states are experienced as a reality. Thus, it is very much necessary to realize the fact that there is no second thing that exists other than the Soul is present in the form of consciousness.

Remember:~

Nirguna (attributeless) is the nature of the Soul, the  Self. The Saguna (attributed) is the nature of the mind, which is present in the form of the universe.

The Soul is the knower of the Saguna (mind). The Saguna (mind or the universe) is merely an illusion, from the standpoint of the nirguna, which is the Soul, the   Self. Thus, the Saguna (mind or world) is a myth from the standpoint of the nirguna, which is the Soul, the  Self.

The Soul is the real Self and eternal identity. The nirguna (Soul) can remain with or without the Saguna (mind) whereas the Saguna (mind) is dependent on Nirguna (Soul) for its existence

Nirguna and Saguna are classified only in duality. In non-dual reality there is neither the nirguna nor the saguna, everything is one. Therefore, the nirguna and the Saguna are one, in essence, that essence is the Soul, which is present in the form of consciousness.

The Saguna is the mind because when the mind is present then all the attributes are present, and when the mind is absent then the attributes are absent.

The Samadhi is the natural state of the Soul, the Self. In the natural state, the attributes are non-existent and in duality ( the mind), all the attributes are present. 

Thus, duality and nonduality are the nature of the Soul, the Self. The duality and the nonduality are not some theories. The theoretical duality and nonduality is nothing to do with the ultimate truth or Brahman.

The world in which we exist is present in the form of objective awareness. The whole objective awareness is created out of single stuff. That single stuff is the Soul, which is present in the form of consciousness. The knowledge of the single stuff is Self -knowledge or Brahma Gnana or Atma Gnana.

The dual (waking or dream) and nondual (deep sleep) experiences appear and disappear. The Soul is the witness of the coming and going, of the three states. 

All three states are made of single stuff. That single stuff is the Soul, which is present in the form of consciousness. Thus, the single stuff alone is real and eternal and the entire three states are merely an illusion created out of the Single stuff.

Realization of the single stuff, which is the Soul, which is present in the form of the consciousness, is Self -realization.

Till ignorance is there the three states are experienced as a reality. Thus, it is very much necessary to realize the fact that there is no second thing that exists other than the Soul is present in the form of consciousness.:~Santthosh Kumaar