First, the theory of ghosts and gods means that there are some unknown and powerful supernatural beings and forces in the world that people can't see or touch, but they just exist. Ghost is a kind of existence or phenomenon after the death of various creatures, and it has some special powers that normal people can't see. God is an advanced life with special power, which will be produced by heaven and earth or changed by human beings. I think these are far from our lives, but they are real and affect our lives. The ancients classified all unexplained unknowns as ghosts and gods they feared.
Second, does the theory of ghosts and gods exist? Modern science cannot prove the existence of the theory of ghosts and gods. In the past, modern science has proved many things one after another. Although it can't be proved yet, with the development of science, these will gradually be explained in a scientific way. In the past, all unknown things were replaced by ghosts and gods, and now the unknown is explained by science.
Third, the reasons for the emergence of the theory of ghosts and gods In the past, there were many things that human beings could not explain, so there was awe and people were afraid of the unknown. When people are afraid of something, they will find a spiritual sustenance, that is, ghosts and gods. People classify all unexplained things as ghosts and gods, which not only explains the unknown with one reason, but also gives them spiritual sustenance, so ghosts and gods are a religious concept.
The history of mankind is very long. When the concept of ghosts and gods appeared, people began to use this concept to explain the world, especially some natural phenomena, which can lead to hallucinations, and some mental diseases can also lead to hallucinations, so that the theory of ghosts and gods became more and more popular until the emergence of modern science.