And what does it matter, Selfsame?
People are people, and people are stupid sometimes.
So what if the creators of the show use ideas based on religion to make the show seem more 'real'?
It's a TV show.
If you don't enjoy watching it, just stop. Not that hard.
It is imaginary; but it is a good way to explain what is wrong and what is true.
Moreover, it is a successful series, which indicates people are interested and have impression about such spiritual ideas.
E.g. Christians have conviction that the evil spirit may settle in the body of another man ... so this latter will be possessed.
Many Muslims may have a similar conviction; while
in the Quran, Satan may have control on man, but may not be in such way of settling inside his body.
Quran 58: 19, which means:
{
The devil has had [complete] control over them g, so he has made them forget to remember God h; such are the devil's party i, and it is the devil's party who are the losers [in the Next Life.]}
....................................................................
g And he has captured their minds.
h And for this reason, they do not fear Him and do not make any consideration for the Next Life.
i i.e. his followers and host.
The interpretation is by Mohammed-Ali Hassan Al-Hilly.
My comment: So Satan has a complete control of disbelievers, but it is not: the devil goes inside their bodies.
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In some other ayat of the Quran,
the disbelievers said about the Prophet that he was possessed by the genie.
Quran 23: 70, which means:
{
Or do they say: "He is possessed by [some] genies"? Actually, he has brought them the [religion of the] truth, but most of them are averse from the truth i.}
..............................................................
i Because they fear lest they may lose their authority and leadership.
http://quran-ayat.com/pret/23.htm#a23_70
My comment: Therefore,
the disbelievers claimed the Prophet was possessed by some genies, then after it
God said that: Actually, he has brought them the [religion of the] truth, but most of them are averse from the truth.