I don't believe in ghosts. They may or may not be out there. I feel it’s the fear of the unknown that gets people the most. Now there are people who claim they have seen ghosts. “Feel” their presence. That prickly feeling on the back of your neck. I have not seen them.
Do you believe in God? If you believe in God, you also need to believe in dark forces. dark forces go by various names such as ghosts, spirits, demons, devils, etc.