Ellie Re. existing and non-existing at the same time consider Schroedinger's Cat
That was a thought experiment - not designed to show that the cat actually is alive and dead at the same time 
Why have you given me a list of logical fallacies? Care to tell me which ones I've been using?
Re. demonstrating spirit. One explanation I can give is as with Scientific Theory. It exists and doesn't exist in the physical realm. It is written down so exists physically (although not as an entity) but when people read it (and test it in life) and consider it true it exists in their thoughts and then the collective thoughts of those that believe it. Like Zeitgeist (spirit of age/time)
Erm. A Scientific theory is a model to describe/explain something. The thing it's describing exists, but the explanation remains conceptual. Putting it into words on paper does not make it into a physical thing.
Lots of fantasies exist in people's minds - as do fictional concepts. I have a concept of Superman. He must exist because lots of people can conceive him, right? Wrong.
The Bible is similar, exist physical in that it is written and in people's thoughts. Except the truth in the Bible in eternal, timeless
The book Harry Potter & The Philosophers Stone is physically written on paper and brings the concept of a boy with glasses to mind. So Harry Potter is real?
Oh - and thanks. I know what Zeitgeist means. Kindly do not patronise me.