If a ghost exists, does it have quality? If there is mass, it must exist in the form of matter, and thus take up space. The earth has existed for hundreds of millions of years, if the ghosts existed, they would have filled this world long ago, and there is still room for the living?! If the ghost has no quality, then it is a spiritual, abstract, illusory, non-material, space-not-occupying existence, this kind of thing can only be people's imagination, imaginary form of consciousness, such as religion, superstition in the gods and ghosts, if you believe in it, it will affect and even influence your thinking and behavior; if you do not believe, it will not affect people's thinking and behavior.
Due to the influence of traditional ideology and historical traces, the vast majority of people in the world do not believe in ghosts, so the "theory of ghost existence" is very popular, and it is very popular, even if the great man is difficult to get rid of. There are also many people who do not recognize the existence of ghosts verbally, but in the depths of their minds, due to historical traces and the influence of people and various media around them, it is still difficult to avoid the influence of ghosts, thus affecting their own thinking and behavior.
Materialism believes that ghosts arise because people's understanding of the objective world is limited; at the same time, people's cognition of the objective material world is endless at present. Therefore, the "ghost existence theory" is difficult to eliminate in the long river of history, even forever, which has led to the long-term existence of idealism.
I think that as a ghost, it is only the existence of historical traces of people's subjective ideology, not the objective existence of reality. The ghost believer is because the ghost consciousness has already formed in the mind due to the influence of the people around them and various mediums; and the unaffected person does not have a ghost consciousness in his mind, so he will choose not to believe.
Therefore, with regard to ghosts, there is faith and there is no belief.