Nobody believes in Demons anymore in this century?

I personally believe if a God exists, then he/she has to have an enemy, such as Good has Evil as an opposite. But I don't believe in the fundie way of demons like possession or afflictions. And you would say that the word Demon came from the Latin word Daemon (Spirit), but in my Greek language and mythology, there were two types of daemons; Eudaimons (good spirits) and Kakodaimons (bad spirits) and there are some spirits in between but I don't remember what their called.