Consciousness
https://en.wikipedia.org/wiki/Consciousness
Phenomenon
https://en.wikipedia.org/wiki/Phenomenon
From a TOP-DOWN approach based on empirical evidences,
there is no denial, the above 'consciousness' and 'phenomena' exist as real.
The above 'consciousness' and 'phenomena' can be verified and justified with empirical evidences via the human-based scientific-FSK.
Anyone deny they do not exist as real?
If no one deny the above, then there should be no issue.
There is only a serious issue when
philosophical realists [and theists] when driven by an
evolutionary default of exuding terrible cognitive dissonances from an existential crisis, insist on the existence of a
substance ontology, i.e. noumenon, thing-in-itself or God which are illusory intelligible objects.
They insist for phenomena there must be noumena or every creation must be created by an ultimate creator.
Such Insistence and clinging_ness to such
substance ontological objects [illusions] is to soothe the real terrible cognitive dissonances.
To speculate that consciousness or phenomena are caused by some substance-ontological entity is engaging in illusions.
Both consciousness and phenomena are emergences and realization of reality.
All we need is to verify and justify both are real within the human-based science FSR-FSK.
Note FSR = ontological, FSK = Epistemological and linguistic.