The soul/spirit cannot exist if we can see material decay of consciousness. Alzheimer’s disease includes genetic factors that demonstrate the material decay of consciousness. This is a physicalist view on consciousness/brain.

Alzheimer’s Disease exemplifies how consciousness is rooted in the brain. Contrary to Christianity’s claims, consciousness is not rooted in anything immaterial.

You have been dying since the moment you were born. The mechanism that tries to prevent cancer and death will eventually turn on you.