I'm not sure that I am understanding your post, but it's gone 12am here so lol, that could also be it.
It's commonly glossed over.
Paul speaks of sin being in his body doing things he does not want to do.
He goes so far to say, it is no longer I who sin but the sin within me that sins.
This disassociation communicates that sin is a separate waste product like exhaust with cars.
Paul later on speaks of how the creation was made subject to sin because of Adam.
So some may have a capacity or sensitivity to this corruption in the earth, but due to the nature of the human mind, it is given a personality and labelled a demon - but the perception is incorrect.
Since demons are angels who were infected by sin also.
In these dialogues where there is this war against demons, it sounds from the descriptions like there is an omnipresent demon - but God didn't create angels with that characteristic - only Humans were created with the capacity to be like and look like God.
So this leads to the opaque goopy sin virus being everywhere connecting to the sin in everything else - thus being the counterfeit of the Holy Spirit - but not a demon, it gets any personality it has from all of creation that it devours instinctively.
When Jesus died and was risen by the Father however, this entity with a perception of "eat everything" was finally told "no" for the first time. So who can really say what effect this had on it.