The brain/mind emerges from activities of ‘matter’, but at the same time ‘matter’ also emerges from the brain/mind. The point is brain/mind and ‘matter’ [the perceived not the perception] are interdependent. As such the basis of ‘matter’ per se is psychological.
The only credible truth of what is matter is based on Science and its scientific theory.
Note;
Scientific theories are at best polished conjectures.
‘What is matter’ is SOLELY based on a Scientific Theory.
Therefore ‘what is matter’ is a polished conjecture.
Thus your one-sided claim re matter as based on Science [a polished conjecture] is not ultimately credible and thus a limited truth.
The debate on the interdependent basis of matter is based on quite a complex set of philosophy, e.g. Philosophical Realism versus Philosophical anti-Realism.
The idea of God [an empirical impossibility] arise from primal crude reason as driven by the existential crisis and angst. This is the same angst (manifesting in a small degree) that activated a child’s mind to conceive imaginary friends.
The idea of God arising within the brain/mind of teens and adults is more sophisticated and with the absence of any empirical elements. The ultimate basis is psychological.
Note I have given evidences as clues to the point the idea of God is psychological.
In addition, I have also pointed out there are many Eastern spirituality addressing the same existential angst on a psychological basis, e.g. Buddhism.
What is critical is, because theism do not recognize the true psychological origins of the idea of God in relation to the existential angst, theism-as-a-whole naturally and by default contain inherent malignant elements of evil potentials. This is very evidence in the Abrahamic theistic religions.
OTOH, the Eastern spirituality that address the same existential angst on a psychological basis do not has any inherent evil elements at all.
Therefore it is very rational for humanity to take a look [discuss and critique] at theism from its true psychological basis rather than the falsehood of God existing as real when in fact God is an impossibility to start with.