system
A chat on 4chan
human
Jinn and Spirits both describe the same phenomena.

suppose...
thought is a pattern of synaptic firing.
this generates a electromagnetic field with a similar pattern.
this electromagnetic field is what is called mind.
how an individual uses this mind is referenced as Spirit.

thoughts can be beneficial, neutral or detrimental.

beneficial = good jinn / spirit
neutral = neutral jinn / spirit
detrimental = bad jinn / spirit

thoughts can be reinforced through repetition.
as an example in parts of the world that use the word Spirit.
through reinforcement a bad spirit can become evil.
further reinforcement a evil spirit can become demonic.

which gives us our first psychologists... the exorcist. 
a person that can break patterns of thought.
gpt
average materialism enjoyer