naomi, the last thing I am is a cynic: I love life, the world and my fellow humans too much to be that.
What I am is a skeptic, which is quite a different matter. A skeptic is someone who sensibly refuses to believe unnatural things until he is shown convincing evidence for them - at which point they cease to be unnatural, of course. All attempts to produce evidence for life after death and the claims of spiritualism in its many forms have come to nought.
Yes, with a group of friends I tried the ouija method years ago with, like you, an upturned glass and pieces of paper. We got "messages" all right, but it makes no sense to assume that they came from some spirit world when there are so many rational explanations to be dismissed first.
How do you know that no-one was pushing the glass? You cannot possible know that there was no subconscious pushing.
Read the entry on the subject in Robert Todd Carroll's book The Skeptic's Dictionary. You'll find that the unnoticed movments involved are called the "ideomotor effect", well-known to physiologists.
The whole thing can be debunked by blindfolding the participants so that they have no control at all over where the board or glass moves. The resulting "messages" are always gibberish.