Background and foreground are always fully integrated as a singular Reality. But man tends to focus on what captures his attention, just as a fish in the sea focuses his attention on the foreground of his world, namely, food and predator. And just as the fish in the sea does not realize he is in the sea, man does not realize the background of his existence. He has become conditioned by the noise in the foreground of his world and has become part of that noise himself. Because he thinks this is reality, this kind of man thinks the solution to problems lies in action. And so he goes about the world, forcing things to conform to his concept of reality, thereby making things worse, as evinced by the current sorry state of the world. The background to existence is not a concept about reality at all, but it is our true nature. But our true nature does not captivate our attention as the glitter and noise of the foreground does, and so we either ignore it or simply don't recognize it as something that exists, and yet, it is the true existence, deep and robust, while the foreground is but a glittering and superficial flash in the pan. Hindus call it maya. Clinging to it eventually only brings misery and death. This is the area of mind. The alwasys-present background is beyond birth and death. It is the sea into which you are born and to which you return at death. Therefore, you don't notice it, just as the fish never notices the sea around him that he too was born into and will die in. But without the sea he will die. We also cannot exist without the background of existence either, and yet, it does not clamor for attention as the foreground does. It just goes on quietly sustaining our lives with full support both internally and externally. When we awaken from our conditioning to the foreground and realize the unity of foreground to background, we become enlightened, and see into the true nature of reality, and that the foreground is temporal and empty of self-nature, and is a projection of the background, which is The Absolute; The Changeless.
As mentioned, the background has always existed, but religion, actually those who came before religion, the mystics, saw the reality of the background and it then became part of religious teachings. I am not referring to religious teachings except as a matter of convenience. I am referring to the immediate experience of the mystic's realization of the totality of existence, of his perfect union with the Universe.
Look! The MOON!