Yes they Do
No they don't
Yes, unfortunately some Theists still believe this rubbish. Welcome to the dark ages.
There will always be some, even if it is a tiny minority.
I believe in good and evil. Not to mention, demon spirits. It may not be proven scientifically. What I can tell you is, there is a whole lot of evil out there in this world and I do believe demons are able enter someones mind through watching things like pornography, and many other things. Call me crazy.. Call me a lunatic.. Call me stupid... I have witnessed enough healing from the power of Jesus Christ to say, "There is Good and Evil spirits." At the same time I don't denounce mental health disorders or anything like that, but believe some things are disabilities are blessings from G-d and others are curses from demon spirits themselves.
Unfortunately, yes. Thankfully, they are in the minority.
No! People haven't believed such things for a very long time! I'm 54 and that thinking was obsolete before my birth. However, I will add this ... Christians, even Believers as a whole, were not the only ones guilty of such ignorant thinking. Society was guilty of doing so, Believers & Non-Believers alike.
There may be an incredibly small .05% who believe this, but in the slightest of technicalities.
None that I've ever heard of.