The Nirguna Brahman(God in truth) of Sage Sankara is impersonal.+

ISH Upanishads: ~ “By worshipping Gods and Goddesses, you will go after death to the world of Gods and Goddesses. But will that help you? The time you spend 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.

All that God propagated by religion is nothing but imagination. There is nothing so absurd that men have not worshipped in religion; every imaginable face has been given to God. If God is the creator, then it is foolish to worship anything as God from his creation, because the creation is apart from God.

Every Religion has its own idea of God. Thus, every religion is based on the false self. Therefore, whatever is based on the false self has to be a falsehood. Thus, the idea of God of any religion is an imagination based on the false self.

Yajurveda – chapter- 32:~  God is the 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.

God is a formless, timeless, and spaceless existence. According to the Vedas, God neither has any image nor does God reside in any particular idol or statue. God cannot be seen directly by anyone. God pervades all beings and all directions.

Mythological Gods and Goddesses are based on the belief. The belief is in no God. 

The belief implies duality. From the ultimate standpoint, duality is merely an illusion. Thus, whatever one sees, knows, believes, and experiences within the dualistic illusion is bound to be an illusion.

Mythological stories are a myth. Whatever is based on myth is merely a superstition. Mythology was introduced in the past for the ignorant masses. It has to be discarded as one progresses in their spiritual advancement.

All the mythological Gods are worshipped in the form of idols. The belief system that propagated ideas of many Gods and Goddesses, Bhakti is the only way to God, is simply trying to lead the people to darkness with its dogma and idea of many Gods, which is apart from the Self.

Mythology breeds superstition, blind belief, and senseless rituals and most irrational and gives them a divine outlook. Mythological stories are a myth. 

Whatever is based on myth is merely a superstition. Mythology was introduced in the past for the ignorant masses. It has to be discarded if one has to realize the ultimate truth or Brahman, or  God in truth.

Remember:~ 

Only in ignorance do the religious Gods with form and attributes have their existence. Gods with form and attributes belong to the religion.

Religion belongs to the dualistic illusion. God in truth is impersonal, which is the cause of the universe, and it, itself, is uncaused.

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 other than consciousness.

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 (God in truth) 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 (God in truth) of Sage Sankara is impersonal. :~Santthosh Kumaar