If you think consciousness is an emergent property of the brain which amounts to so many electro-chemical reactions, then yes, you are correct: it does not survive beyond physical death.
But the experience of spiritual awakening is the realization that consciousness is non-local; that it has always been the case; that is has never come into being, and because of that, will it never cease to be; that it is, unlike the mind, unconditioned and free of all taint; that it is like the vast sea that the fish is born into, and not just so much mental thought that emerges from the limited mind/brain. It is the vast sea that you are born into when you undergo this unfolding; this awakening to what is. It is the dissolution of the illusory self that thinks it contains consciousness, when it is consciousness that contains and permeates everything. It is the realization that the universe is not dead, unconscious matter, but living, conscious, intelligent, and vibrant energy at all scales of existence.
Contrary to what you think and have been taught by your sterile black and white science, consciousness is not created by the brain; the brain is the product of consciousness. The brain is how consciousness automates the functions of the body, so it can focus on what is up front in the immediate here and now. If consciousness had to pa attention to beating the heart, breathing the breath, flowing the blood, digesting nutrients, etc, at every single moment, we would not be able to enjoy an existence beyond mere survival. In fact, we may not even be able to survive if our attention were constantly diverted from things in the immediate present, such as a tiger lurking in the bush. So consciousness hard-wires the brain for certain autonomic and repetitive functions. We now know, for example, that long term meditators actually grow thicker cerebral cortexes than non-meditators, a sign that higher consciousness is re-arranging the brain in ways that the ordinary man knows nothing about.
If you think consciousness is an emergent property of the brain, then show me how non-material consciousness is created by the material brain. At which point does this occur? No one has come up with a satisfactory answer to date, not even close.
Your consciousness is not your consciousness, but is the consciousness of The Universe. You don't think so, because you cling to "I", and "I" thinks it is the doer of everything, when the reality is that "I" is a total illusion.