In my view Buddha Nature and Christ Consciousness are the primary consciousness that has been overlayed by cultural Ego, a secondary consciousness that in our culture has become primary, thus making our primary consciousness (since you cannot have two consciousness at the same time) thrown into the future to be attained as enlightenment. To the Ego consciousness, the primary consciousness is death, so it is thrown into the future.
This creates tension in the conventional consciousness where it has to deny its primary consciousness in order to exist.
Socalled primitive consciousness is Buddha nature because it is in total harmony with the environment. The primitive is always at the right place at the right time. Just as elephants leave the beach before the tsunami arrives, before any evidence, the primitive consciousness and nature are One.
Secondary or Ego consciousness is for tool making, but modern society has made it primary, pushing original consciousness into a sleep. Time is created in order to restore original mind in the future, so one you have primary and secondary consciousness at the same time even though they are split. I can have my original mind in the next moment, with this new product or religion.
Non-dual spiritual practice has the goal of bringing these two minds back as One Mind, and awakening arrives when one realizes that they are always already One mind. Practice brings us to the point where we realize practice itself creates the separation between primary and secondary minds.