Is God a concept?

"To believe or not believe in god, both concepts are intellectual". God is too complex for humans to create an accurate conception. It is not possible to comprehend God, which is unlimited?
All that you see outside is the creation of the mind. This is the basic principle of vijnana-vada. Vijnana is the consciousness in the mind or consciousness itself as the mind, which projects itself as an outside world of perception.

God is ONLY THING!!!

Brahman is the basis, source and support of everything — the source, material and effect of all creation known, unknown and yet to happen in. Brhmati iti brahma; [It is not a known thing; It is not also a totally unknown thing.]
Brahman is inclusiveness. Everything is inside It. Even the one aspiring to know It is included in It. If someone is to know Brahman, that someone stands outside Brahman. There is nothing outside Brahman. There was nothing before creation, so can not understand creation.
“தத் தூரே; தத் அந்திகே; தத் அந்தரஸ்ய சர்வஸ்ய; தத் சர்வஸ்ய பாஹ்யதே”
That has spread every where. It is in universe, in you, in everything. C
osmos is image or reflectionof that
பஸ்தி ந சூன்யம் | சூன்யம் ந பஸ்தி
That is, neither without anything nor anything is without it

God and we

God is one of the words to refer this Supreme Energy that created the universe and laid down the rules of physics, mathematics and all sciences that we know. Each one of us is really part of the whole, a drop of the ocean, a ray of the brilliant light - into which we get to merge back when we leave this body. We are here each to fulfil some mission, some part in the supreme design and each one of us is really part of the big picture and fit in neatly into his plan, according to the roles he designs. The supreme God is omnipotent, omnipresent, omniscient and omnivalent. God manifests in any shape, gender and form we desire.
We all speak about God, creation, and the relationship between the two. God is beyond all human knowledge. The complexity of finding relationship with an unknown entity, becomes easy when we use different metaphors to describe God and our relationship with God.
எண்ணாயிரம் ஆண்டு யோகம் இருப்பினும் கண்ணார் அமுதனை கண்டறிவாரில்லை
உள் நாடி ஒளி பெற உள்ளே நோக்கினார் கண்ணாடி போல கலந்து நின்றானே
Simple interpretation of above verse:
Even if you spent thousands of years, you can not perceive God, who is beyond physical attributes like form, smell, sound and all. No one can describe and do not know exactly what it is. By looking inwards, we can understand God is essence and life force of everything. God is part of real "me".

Has no comparison

There was a great saint by title, "Vak kesari", who was preaching there is no comparison for God, as God is unique and beyond discussion. [] He came to south and established temple called Oppilla appan. Oppilla means no comparison. Appan means God in tamil. Atthan is word for father. Local pandits, who prays to various deities, complained to King that new person is corrupting the people, by preaching wrong things. When King questioned him, he told as King is unique in his kingdom, God - king of all and everything is unique. Anything which can be described, can be compared. He was recognized as saint and established a temple, with out deities with forms. Nammaazhwaar called God "Thannoppaarillappan", that is he who has no comparison (i.e. there is neither an equivalent nor superior to the Lord - mikaiyum oppum illaathavan).
After some time, name of deity got changed to Oppiliappan and legend story was created, with usual characters god and rishi. Lakshmi appeared as a baby under the already incarnated tulasi plant (tulasi chedi) for Markandeya. Lord appeared as an old man and asked for the hand of Markandeya's daughter in marriage. Markandeya replied that, "You are very ripe and old, my daughter is too young and she does not even know how to cook with proper salt (lavanam) contents. You may get angry and curse her if she does not cook properly. This is not fair. You are bodily old but mentally very aware. You must forgive me and bless me but this will not work out." To which the old man replied, "If your daughter must cook without salt, then I will still take it as my best food, but I will not leave from here without marrying her." Without knowing what to do, Markandeya sought the help of the ever protecting Lord Vishnu. It was then that he realised using his thapobalam, that the old man was none other than Lord Vishnu himself. When he opened his eyes the Lord appeared in front of him with conch and chakram as in Sri Vaikundam. Markandeya asked for forgiveness and offered his daughter's hand in marriage and performed the kannikaathaanam of his daughter (Lakshmi) to the Lord.

God - concepts

Many arguments which attempt to prove or disprove the existence of God have been proposed by philosophers, theologians, and other thinkers for many centuries.
"God does not exist" (strong atheism);
"no one knows whether God exists" (agnosticism);
"God exists, but this cannot be proven or disproven" (weak theism); and
"God exists and this can be proven" (strong theism).

God definition - contradictions

God's omniscience may seem to imply that God knows how free agents will choose to act. If God does know this, their apparent free will might be illusory, or foreknowledge does not imply predestination; and if God does not know it, God may not be omniscient. Deism holds that God is wholly transcendent: God exists, but does not intervene in the world beyond what was necessary to create it. After creation, no purpose for God.

History of monotheism

Ancient times, each group/tribe had a local patron deity. But Svayam bhagavan or kadavul is an old theological term that refers to the concept of absolute representation of the monotheistic God within Hinduism.
Monism or monotheism emerge in the same period, during the Nasadiya Sukta, upanishads, thirumandiram etc.
Monotheists hold that there is only one god, and may claim that the one true god is worshiped in different religions under different names. The view that all theists actually worship the same god, whether they know it or not, is especially emphasized in Hinduism.

Life is just the way by which people travel

For Taoists, the true reality is known as Tao, which roughly translates as “way” or “path.” In the writing of Blakney, Tao is “a road, a path, the way by which people travel, the way of nature and finally the Way of ultimate Reality” (In Lao Tzu 37). Also the Taoist script known as the “Tao Te Ching” states that the Tao is “from which all things come” (Lao Tzu 56). This script also emphasizes that the Tao cannot be explained in words, “nameless indeed is the source of creation”

For Believers: God

GOD hears what is not spoken and
Understands what is not explained;
God will bring you good through God's agents.
Happy moments, praise God.
Difficult moments, seek God.
Painful moments, trust God.
Always, worship God.