Materialism
Reality is made up of matter. The Universe of matter is everything that is, nothing exists outside of it, be it a supernatural being or consciousness.
Energy also redirects here, since matter and energy are interchangeable.
The principles of logic and time can be said to exist outside the material universe, but that is only because these are inevitable principles of reality, not immaterial beings.
See Materialism on Wikipedia.
Mind Over Matter
Dualism asserts that the subjective experience of consciousness is often believed to exist outside of the material plane. However, since it is simply a by-product of neural processes in the brain, and it does not have any downward causality that would lead to free will, it should not be seen as conflicting with a purely materialist view of reality.
Emergent dualism distinguishes between physical matter and the mind that emerges at sufficient levels of complexity. Similar to the practical definition of free will, this definition simply describes different modalities in the behavior of matter, rather than a non-material agent.
More simply put, mind is like how we describe the behavior of a beehive or ant colony. Those things "exist" and exhibit their own "agency" which is useful to describe their behavior, even though they are just emergent properties of large collections of bees or ants.
Mind is an emergent property of a large collection of neurons, just like a hive is an emergent property of a large collection of bees. It is made up of matter, exhibits its own sense of agency, but has no "spirit" or other non-material essence other than emergence. It can sometimes help to think of mind or spirit in dualistic terms, but it is important not to confuse the emergent with the supernatural.
Spirit is Emergence
Spiritual terminology and dualistic philosophies are historically employed to describe phenomenon that we now know as emergent. It is how we traditionally describe the holistic behavior of the brain, societies, and the universe. Until the emergence of the concept of emergence, it was not possible to describe the aggregate behavior of complex systems using scientific language.
Using a beehive as a metaphor, it is obvious that the hive is just a bunch of bees. However, it acts as if it has its own sense of agency, and describing the behavior of the hive is more useful in many cases than a reductionist description of the individual bees. Spirit may just be a bunch of neurons, but it's useful to articulate their emergent behavior holistically if you want to understand it.
This is why there is so much excitement over fractals and complexity among those who discover these concepts. It bridges the gap between the spiritual and the material, allowing us to finally incorporate traditional knowledge into a robust and meaningful conversations about the nature of mind, consciousness, and the universe, without invoking unprovable, non-material agents.
Interpreting the Spiritual as Material
Spiritual terminology is often used to reference and elicit mental and emotional states, in a manner similar to poetry and music. These should always be interpreted as allegories for processes within the material universe and their emergent consciousness by-products, rather than literal descriptions of things that somehow exist outside of the universe.
This allows you to interface with rituals and other practices that have evolved over centuries to produce higher emotional states, reduce suffering, create in-group bonds, and other benefits, without reliance on any supernatural belief structures that bypass reason and are not subject to scientific inquiry. Beliefs that lend themselves to authoritarian abuses of power.
Materialism Keeps You Sane
Having a strong commitment to the materialism will prevent you from descending into magical thinking during trying times, or when encountering things you can't explain. Ruling out the supernatural forces you to look for rational, logical, scientifically reasonable explanations for things. Without this commitment, conspiracy theories, pseudoscience, and all kinds of spiritual woo are considered fair game by your brain. This can be especially true for those who dabble in psychedelics.
Kooky concepts confuse consciousness, creating contradictions and contrarians.
The best way to avoid them altogether is with a steadfast commitment to materialism.
What If You Just Really Like Stuff?
In that case you are materialistic.
You can find many other examples of materialistic thought on social media and YouTube. But these videos are about materialism.