I'm Non religious. Therefore, no.
What have ghosts got to do with religion?
I believe in ghosts, but I don't believe ghosts are dead people.
It's something I've noticed, as well. Even here in "real life" - and mind you, this is from my own observations - despite a little bit of research, I have not found a whole lot to back this up.
I've noticed religious people are more apt to believe in ghosts than those who do not believe in any gods. Granted, depending on the person, their definition of what a ghost is (a spirit, demon, time playbacks, dead relatives visiting us, etc) and what its objectives are (one last visit, unresolved issues, pure evil, fool good people into wandering off the path, etc) can change dramatically - yet the belief remains.
Why?
To be blunt, it comes down to not only intelligence, but gullibility. Those who believe that the loose and very poor translated stories of a group of wandering tribes are the words of some great being that created everything - and is constantly pissed that things are not working out the way it wants - are also apt to believe loved ones will forgo their trips to paradise or eternal damnation so they can pop on in here and say "hello".
Meanwhile, I've never had a conversation discussing relativity, singularities, dinosaurs nor global warming interrupted with "Hey, by the way, my dead aunt came by last night. I couldn't see her clearly or anything, but I felt her brush my shoulder just when I was about to go to sleep."
Ah! "Just about to go to sleep!" I see this a lot (along with the "didn't see it clearly, therefor it has to be a ghost" argument).
This is where, once again,
Carl Sagan's The Demon Haunted World comes into play. In this book, he points out that many ghost/spiritual/Jesus visits/alien visitations happen when the person is either at that moment between being partially awake and being asleep, or when the person IS asleep.
Quite a few things happen to me when I am at that moment of time. Quite a bit, I get a
feeling of falling (this is simply because my body is becoming extremely relaxed, and my still quite active subconscious mind is telling me "Oh...the body is completely relaxed...we MUST be falling), very rarely a feeling of being suffocated (a form of
sleep paralysis), hear voices (sometimes, it will simply be a voice outside, other times it will be my subconsciousness beginning it's dream state), and, yes, ghostly visitations. However, my mind is also complete enough to understand that these are not actual ghost visitations, but simply my subconsciousness beginning to tell a tale.