Is God an invention of man's mind or true being?

Is God an invention of man's mind or true being. Leaving every thing aside first of all I will try to categorize human mind. While having a survey of human history we come to know that there have been three main categories of mind. The first that has been involved in the betterment of this world only. They have not been in concern with the betterment of any other world. Their sole aim has been to get authority in this world and that's all. This category of mind has been in politicians. The conquerors, the warriors and the rulers have always been falling in this category of mind. To kill others for their personal survival, to subdue people to their authority and to terminate all others of their types have been their chief interests. The second category of mind has been of poets. We have been seeing this category in other creative men as well. Their aim has been to please others. They have not been in concern with this world and any other. They have not been even thinking in the real sense. Their sole aim has been to work under their qualities. They have not only been pleasing others but also their own selves. The minds of scientists and business men seem off shoots of this category of mind.

The third category of mind has been of religious people. All over the world, all over the ages they have been the same. (so have been the minds of other categories). They have always been claiming the existence of some other world. Their sayings have always been of the same type: life after death, the transience of this world and permanence of the hereafter. They have always been telling their fellow men about some existence living beyond their thinking and imagination. They have always been talking about God or Creator. Now when we feel that the other categories of mind have been true in their working and results. Whatever our opinion is about them. We cannot deny their existence. We cannot say that in reality they had no existence. We cannot say they were untrue. We may lose interest in fine arts and creative arts but we cannot say that they have never been a part of our lives. We cannot say that these arts have never been existing at all. Philosophy has lost its value. It doesn't mean that there has never been this subject. Or we cannot say that it has been without any base. In the same the old arts may be replaced with some others interests. But it will not falsify their past. Likewise the modern government may be of the people for the people by the people, but we cannot say that there has never been any ruler in the world. Nor can we falsify their existence. The people in future may live without any ruler. But it will not prove that there has never been any ruler in past. Nor it can prove that the old rulers have been of unnatural order. We can feel that the development in mind is changing the outer existence. If we are not living in the cave ages it is because of the development in mind. The African countries where this development has not taken place are still living in those cave ages. They may be wrong but they are not untrue. The cave people have been as true as the modern people are. Or further as the future people shall be. In the same way if people have been believing in some God or Super power they have been very much true. We may stop believing in God of the old times. But we must in God of the modern times. We can't help it.
Our mind has never been thinking about any thing non-existing. Five thousand years ago the people have been thinking about those inventions we have invented today. For the people of those times they were mere fantasies. But now they have been proved true. We cannot think about what doesn't exist. We may become helpless to prove it. But we cannot say that it doesn't exist any where at all. If we have been thinking about God, if we have been feeling about Him, if some of us have been talking to Him and the others receiving messages from Him, He must be existing somewhere. We cannot think about any non existing thing. Imagination, fantasy, vision are only temporary helplessness. Otherwise everything exist somewhere. Whatever we think is possible. It may look impossible at present. But it may become possible in some other age. Impossibility and non-existence lie nowhere in human mind. Human mind is made up of knowledge of all times. Whatever it thinks is a knowledge. Knowledge is reality. There is no opposite of reality. Something real may look unreal at some other time. And something unreal may look real at some other time. To be real therefore is a relative thing. If our mind is not willing to accept it, it doesn't mean that God is no more a REALITY. The people or minds have been traveling away from God in all ages. Keeping in mind the biblical story of the arrival of man on this earth, we can feel that for the first man God was quite real. He had talked to Him and listened to Him. He had also lived in that heaven what became a mere promise for his generation. The heaven and God and for the coming generations however were not so real. They must have felt doubts about their existence. That doubt has always been increasing from generation to generation. Today if some one says that God is merely the invention of our mind he is living in the extended form of that doubt. Mind has not been inventing anything what has never been existing.