What is the link between Civilizations from other planets and Angels, Demons and Ghosts?

Hi there I get there are far more advanced Civilization with amazing tech, abilities and insights. They have spaceships around Earth to monitor and help Humanity to grow etc.

Then you have Angels that protect people in Crises like Vehicle accidents and life and death situations. You get Ghosts or Rembrandt's of people that lived. Some people say its part of a Soul that stays behind. You get Demons of all sorts witch could harm you or rune your life witch I have seen myself. There are Fairies, Elf's, Sylphs and Gnomes that fall under the elements on earth.

How do these 2 groups fit into each other. Is it a matter of perspective that dictates one's reality and thereby determines what you see? Or is it that they both exists and somehow work with each other?