I've thought about this issue some, because I had ancestors who believed in ghosts, but a person who believes that the spirit of a dead loved one can be contacted and interacted with might tend to think that heaven and hell were myths.
Most people don't think it through. The apparitions and ghosts are not dead humans. They are fallen angels looking to deceive. So many people get caught up in the occult because they think this stuff is harmless never thinking we are in the middle of the battlefield.