What evidence do you have for that supposition?
Oh wait, the same evidence you have for god being real: i.e. he must be real because we couldn't have just imagined him.
Does the same apply to Lord of the Rings? All of science fiction?
Dywyddyr, look at yourself as an example. You never existed before. Before you were born there was nothing, not even dust of you. But faith and idea alone gave rise to a concept of baby that was due to be born...a man who grew now to be Dywyddyr.
Where would be now if there was no faith? :shrug: