We create our own realities.
The world we perceive is a dream. There are different dreams at different levels of reality.
Schrödinger's cat may be both alive and dead, since, in reality, he's a potential. Light might be a wave or a particle. It depends on your perception.
For some, gods exist, they're real. But they're not ultimately real; not objectively real.
Perforce, we live in the world we perceive. Maybe it has gods, trees and cars, maybe not. Reality is an individual dream.
Isn’t the point with Schrödinger’s cat, that while in the box, rather than being alive or dead, he exhibits characteristics of both states simultaneously? It’s only when the box is opened - ie a measurement is taken - that the duality (observable in the form of interference patterns) collapses into one or other state.
Adherents of wave function realism tend to argue - I don’t think they all agree - that a higher reality, a universal wave function (which you might perhaps call Brahman) directs all the quanta in a higher dimensional universe. We as observers inhabit a 3D world (actually 3 spacial dimensions and one temporal), but the universal wave function describes a 3ND reality, where N is the number of particles in a system. Thus, the fundamental spacial and temporal relations of the world we appear to inhabit, are governed by the dynamics of a higher dimensional reality. We can observe some of the workings of that universal wave function in high-dimensional space, but our limited consciousness, in it’s current stage of evolution anyway, cannot possibly envisage or conceptualise it.
As Immanuel Kant said, it’s not that noumenal reality doesn’t exist, but rather that our experience of it is necessarily subjective, and the relation between noumenon and phenomenon in human consciousness is never entirely reconcilable.
In the story of Chuang-tzu’s dream, he awoke from a dream in which as a butterfly, he was oblivious to the fact he was Chuang-tzu. On awakening he was uncertain if he was a butterfly in Chuang-tzu’s dream, or Chuang-tzu in the dream of a butterfly. Both realities are perhaps equally real and equally illusory, but the true significance is that Chuang-tzu and the butterfly share a common awareness, through their apparently separate but ultimately interdependent subjective paradigms.