insidious demon

to the people who do believe in demons, are there no evil ones or any like the once depicted in cinema.

A trouble with this whole issue is that Good and Evil used to mainly mean helpful or harmful, rather than a moral judgement. Demons don't care about human morality either way. They function according to their own rule system which is very advanced. They could be good or evil as in an aid or a trouble. They are more concerned with accomplishing their goals than what a petty, young race would think of them. That being said, they do not go out of their way to harm. A lot of people's negative experiences with them are because they tried to control them or misuse them. From my own workings though, it seems they find it amusing how afraid people are of them.

Good one aeons wings

Yep