Even in materiality there is obviously a "spiritual" threshold so there must be a balance. Meaning "energy" locked in material structures, like an atom, and down into the sub-atomic, is very hard to determine the "materiality" of. The atom itself is a bit of a high speed high energy "illusion", as is materiality really a spiritual based illusion. Humans have barely scratched the surface as to where the "material" and "spiritual" really over lap, and due to the energetic basis of all "materiality" it is greatly accessible to "spiritual" energy alteration.
Now if we construct the atomic pieces into a human brain, we start to understand the geomteric complexities humans are far from understanding and which require a complete understanding of to even start to get into the "spiritual" worlds. Man cannot even clearly define "material" not to mention the sub-components of the "material world" below the atom in "scale", so what really is then "spiritual"? There has to be spiritual components that make up materiality, because eventually even the material is just packets of various energies, and what can give an energy it "energy"?
If energy cannot be created or destroyed, then what is the big bang? a massive creation of energy? And so man lives in an enigmatic paradox of conundrums in the quest for "knowledge" beyond human, beyond universal, imo, and must settle on error as truth, until the truth can be proven to be error, over and over again as long as man has been compiling "knowledge".
To avoid going nuts, many just settle into the most comfortable error they can find, and at some point they stop "looking into it", and just live out their tenure as doctors of the popular error of their time, and all must become philosophers to defend the error they have chosen, until the new paradigm sweeps them from office, in time, as it always has done before them. What is interesting is how long that newer paradigm takes to get a foot hold, some errors persist for quite some time and many are half true extending their stay.
I think at times people look for an either or answer, but in reality there is often an inter-relationship at work, a synergy of combined forces.