“Any paper that discusses or describes singularities in the field equations of general relativity is discussing extra-natural objects.”
Materialists argue that dualism of mind and brain is not possible because of causal closure — by which they mean that all physical effects have physical causes.
Imagine a chain hanging from the sky supporting a weight suspended in the air. Each link in the chain is a cause for the continued suspension of the links.
The pretense not to know things is at the root of Darwinist/atheist/materialist ideology.
A materialist view of reality leaves out much of reality (love, reason, mercy, truth, etc.) so skittish materialists often call themselves “physicalists.”