Why do you think whether a person who understands and use science(s) or its respective field(s), or not - have to fall within the parameters of “atheism“ or ”theism”, or to any other religious-philosophical “-ism” types (eg monotheism, polytheism, henotheism, Hinduism, Buddhism, Taoism, panentheism, pantheism, deism, agnosticism, etc)????
All of these -isms, including that of agnosticism and atheism, only deal with the question of existence or nonexistence of a deity or deities, nothing more, nothing less.
Where theist would say he believe in a deity or deities existing, atheists would either don't believe or lack the belief. None of these 2 stances have anything to do with Natural Sciences or Physical Sciences.
Physical Sciences and Natural Sciences have much in common, as they adhere to Methodological Naturalism, and adhere to requirements of the following standards:
- FALSIFIABILITY
- SCIENTIFIC METHOD
- PEER REVIEW
If any new hypothesis or updates/modification/addition to any existing scientific theory, that don't adhere to these 3 standards or requirements, then the concept isn't science and won't be accepted as science. In fact, a concept that fail to meet the Falsifiability requirement would mean that the concept isn't even a hypothesis, because the concept is untestable, and won't and cannot proceed to the next requirement - Scientific Method.
There are much in common, between Natural Sciences and Physical Sciences, as they use the same sciences:
- Physics
- Chemistry
- Earth Sciences
- Astronomy
The big differences between the two, is that Physical Sciences ONLY focused on non-living phenomena, whether it be natural or man-made.
Natural Sciences deal with both living phenomena and non-living phenomena, HOWEVER it doesn't include anything that are "man-made".
To put it into perspective for you, as to what Physical Sciences are involved in, just about everything physical, but some are natural (eg rocks, earthquake, mountains, oceans, planets, stars, galaxies), and so on, all these are both physical and natural, but not man-made (and non-living), while anything that have do with technology or engineering are man-made (eg roads, bridges, cars, ships, clocks, tv, computer hardware, etc).
Natural Sciences also focused on natural phenomena that can be either "non-living" (I have already given some examples of non-living but natural, like rocks, oceans, planets, etc) and "living".
The "living" parts of groups of other sciences (and fields) under Life Sciences, generally termed as biology. There are abundance of different fields in biology, eg microbiology, botany, zoology, anatomy, physiology, genetics, evolutionary biology, cell biology, molecular biology, biochemistry, biophysics, etc.
You had mentioned "culture" in your post.
Culture have to do with human's behaviour, social interaction and practices/habits that are norms in specific human societies. Culture is often tied to some regions, so what the social norm in United States, would not be the norm for societies in Islamic societies or in Tibet, and vice versa. Cultures can range from a number of different areas, such as beliefs (eg personal opinions, political views, philosophical views, religions), customs, arts, literature, music, food (cuisine), laws, politics, etc.
Natural Sciences and Physical Sciences don't deal with any culture. The studies of cultures fall under the Social Sciences, like anthropology, sociology, law, political science.
Social Sciences don't have to adhere to Methodological Naturalism, nor to Falsifiability and Scientific Method, because in studies like psychology and behavior science (or other related fields), required to study human emotion and behaviour, which involved listening to patients' personal views. So dealing with patients' problems, the evidence can be highly subjective, as can be with any counselling and treatments, again subjective.
The evidence given in Social Sciences, don't require the evidence be "physical", nor "natural".
Regardless, atheism and theism have nothing to do with Natural Sciences.
Being a scientist, whether this scientist be a physicist, chemist, biologist, geologist, astronomer or astrophysicist, these are professional jobs, required a person to be QUALIFIED & EXPERIENCED in his or her respective professional field.
Being a theist or atheist, isn't a job, and you don't need to be qualified be either one of them.
Like every other creationists here and elsewhere, you are confusing atheist with scientist, or atheism with science. Neither of them are synonymous to one another. You are generalising, BTP.