Yet again, you make the same fundamental error of anthropocentrism. The assumption that our human self-consciousness, our awareness of ourselves as individual and complex entities, is somehow important or special. In this case, you even go so far as to insinuate that everything else only exists because we think it does. When one points out the obvious - that the Universe precedes human perception and self-consciousness by a few billion years - you fall back on the notion of God. Naturally an anthropomorphic God whose self-consciousness is just like ours, only bigger.
While it is highly likely that there is some part of us that is non-material, some kind of subtle energy linked to the body via the brain, that alters nothing. The effects of lack of sleep, food and so forth on our mental processes shows us that our non-material part is as dependent on our physical wellbeing as our bodies are to function well. It therefore follows that when our physical bodies die, so does our non-material apect.
Taking this further, and noting the life-forms with which we share our evolutionary past, we can also theorise that the material, physical part pre-existed the non-material, but that both have evolved together as species became more complex and intelligent. An amoeba may not be very conscious, or even conscious at all. A fly is conscious enough to find food, a mate and somewhere to lay her eggs, but that's about all. A wolf has enough to learn not to repeat mistakes. A gorilla has some awareness of itself as a distinct individual with likes, dislikes and a social position to maintain and enhance. A human has far more, enough to say 'cogito ergo sum' or wonder 'to be, or not to be'.
But in terms of the Universe, overwhelmingly lifeless and utterly unconscious, hurtling from an uncertain beginning to an unknown end, moved by laws we can barely begin to guess at, we are nothing. A blip, a glitch, a tiny anomaly in a process we can neither understand nor influence.
Accepting this, we either set to and make the best of what we do know and understand to make our lives more tolerable and even enjoyable. Or we shake our fists defiantly at absurdity, and attempt to enforce purpose and order on the chaos. Or we sit contemplating the skies, or our navels, and imagine fairy stories to make the Universe warm and fuzzy.
