Apart from original or actual sin, do demons cause 100% of diseases and have the authority to retain them in the body? I believe since we live in a fallen world with original sin, sickness and disease is the natural cause that eventually leads to death.
I saw this: Vatican bishop diagnoses sin as cause of sickness
"A demon under every rock"? I don't think there isn't dogma or doctrine on this question, if so, please share it.
I am trying to determine the role of demons with regards to human and animal disease. If demons have the right to retain sickness in a human or animal, then could it be said the consequence of sin is physical (and spiritual) death, but not only physical (and spiritual) death caused by natural disease, but also by demonic influences of sorts 100% of the time? Thereby all human death is related to demonic influence.