The word God is the best word to express because the ignorant populace is attached to the word God.+

GOD IS a mere word used by the religion who believed there is a higher power that is the cause of the creation. Different religions used different words for the same thing.

The idea depends on the man’s imagination. God is an English word. The different language uses different words for the same thing.

The words are there for only communication purposes.

The Sages of truth called the ultimate truth as Brahman. For them, the ultimate truth is God in truth.

The earliest uses of the word God in Germanic writing are often cited to be in the Gothic Bible or Wulfila Bible, which is the Christian Bible as translated by Wulfila (a.k.a. Bishop Ulfilas) into the Gothic language spoken by the Eastern Germanic, or Gothic Tribes. The oldest part of the Gothic Bible, contained in the Codex Argenteus, is estimated to be from the fourth century. During the fourth century, the Goths were converted to Christianity, largely through the efforts of Bishop Ulfilas, who translated the Bible into the Gothic language in Nicopolis ad Istrum in today's northern Bulgaria. The words guide and guþ were used for God in the Gothic Bible.~wiki

All these experiences as the father, son, guru, pupil, and the world were one and the same consciousness appearing differently. All these distinctions disappear when one realizes the ultimate truth

Remember:~

The word Brahman means ultimate truth or reality which cannot be indicated by any word. The Brahman can be expressed through silence because it is beyond the experience of form, time, and space. Therefore, the word Brahman clearly stands for the essence of the three states, which is consciousness only. The final use of pursuit of truth is to know that the Self is consciousness. 

The word God is the best word to express because the ignorant populace is attached to the word God.

Brahman -The English use of the word real as applied to the material world, whereas we Advaitins use it as applied to unseen Atman or the consciousness. Hence, many errors have arisen in translations from Sanskrit.

Brahman ~ The word Brahman or Sat has no proper equivalent in English. The nearest is ultimate reality or ultimate truth. The west, however, applies reality to individual objects or to the multiplicity of them all: whereas Advaitins apply it to the nonduality. Brahman is called "That" because it is something not known yet by the seeker.

The words are used for communication purposes. From the non-dualistic perspective, the words are meaningless. The words are only used within the dualistic illusion to indicate the truth, which is beyond form, time, and space.

The seeker of truth should not become attached to words as being in perfect conformity with meaning because Truth is not in the letters.

The words and their discrimination bind one to the duality; meaning stands alone and is a guide to non-dual awareness. Meaning is attained by much learning, and much learning is attained by becoming conversant with meaning and not with words; therefore, seekers of truth have to avoid the sticklers for particular words.

Sage  Sankara opposed the Buddhists only, who misunderstood Bhagavan Buddha and became atheists. According to Sage Sankara meditation always means the critical analysis about the self to get salvation from worldly tensions. Due to the eccentric ego of the then atheists, Sage Sankara did not go beyond this since the atheists will not accept God beyond themselves. This limitation is not due to limited knowledge of Sage Sankara but is due to the then-existing situation of the psychology of the surrounding society. 

Even Bhagvan Buddha kept silent about God because the society dealt by Him consisted of Purvamimamsakas, who were strong atheists. Bhagavan Buddha told that everything, including the Self, is only relatively real (Sunya).

This is correct because the self is a part of the universe, which is relatively real concerning the absolute unimaginable God. Bhagavan Buddha stopped at this point because the atheists cannot realize the existence of the unimaginable God indicated through His silence.

The point of Bhagavan Buddha is that if God is non-existent, the entire creation, including the Self is non-existent.

Sage Sankara wanted to establish the existence of the Brahman. For this purpose, He made the Atman as the Brahman. He brought out the identity of self with consciousness and made the Atman the Brahman. Since one will not negate the existence of his self, he will accept the existence of the Brahman, which is the Atman or Soul, the Self. Both Bhagvan Buddha and Sage  Sankara kept silent about the absolute unimaginable God. The same philosophy was dealt with by them from different angles in different situations. : ~Santthosh Kumaar