I want to take this slow. If we were having a verbal conversation, this would be much easier.
Define natural.
Define physical.
I'll go first.
1. The word nature is used in a significant sense in the Scriptures in many different places.
For example,
1Co 11:14 Doth not even nature itself teach you, that, if a man have long hair, it is a shame unto him?
1Co 11:15 But if a woman have long hair, it is a glory to her: for her hair is given her for a covering.
Most people focus upon "hair length" in these verses, but I do not. Paul distinct appeals to nature for evidence. He does this because there is ZERO evidence from Scripture that details the length of hair that men and women should wear.
We must accept the very fact that "nature" teaches us. Paul repeats this very "theme" later in his writings in Romans 1.
Rom 1:20 For since the creation of the world his invisible attributes – his eternal power and divine nature – have been clearly seen, because they are understood through what has been made. So people are without excuse. NET edition
Notice. "because they are understood through what has been made"......
NATURE.
I mention the following because this battle you're fighting yourself has long been fought in the history of men. In theology, we reference this "subject" as Anthropomorphism.
Many Christians fear this subject because they associate it with "Idolatry". I believe you do the same. I do not. Man was made in the image of God. Adam carried forth the attributes of God in his very construction. We ourselves craft/create/fabricate things trying to give to those creations our characteristics. AI is just another attempt in the long history of man's attempts to duplicate what was done in own existence.
You should NOT fear the topic of Anthropomorphism. We discern our very existence through our experience. The Scriptures declare this to be true in the verses I posted above. I can list many more, but you should consider these verses I've shared with you.
2. Physical
This where the conversation gets a little "muddy". The English word "Physical" has no true Greek or Hebrew origins. "Physical" is really a "hodgepodge" of many different words. Suffice it to say. Many people see the word "Physical" to be synonymous with nature.
The Greek source root φύσις comes to use THROUGH Latin. You should realize that Latin is a complicated language that has spawned many modern misunderstands about the source.
φύσις = Physis
Look familiar? It is the very word that Paul used in 1Co 11:14 that is translated in most all English translation as "nature". To me, it most closely aligns with what we would reference as the study of "Physics" today.
Physics is all about matter. Nature is all about matter. I'm not trying to say that Physics defines God. Not in the least. However, Physics does help us understand what is around us. Physics is more than a scientific exploration to "quantify" and categorize everything that exists.
Physics is philosophical. Also, philosophy in nature does fit into some sense of "categorization" of Physics.
And... that is where we are right here.
You are struggling to categorize "Spiritual" absent any Physical attributes. Which really is nonsensical.
Where is heaven? Maybe this will help. Is heaven physical?
To deal with this, you can't deny the tangible nature of heaven.