He asked about demons...  

"Yes, we may tell you and him that there are certainly what you would term demons on your earth. Some souls are so troubled that they allow themselves to be inhabited by energies that are dark and damaged. These energies or entities look for suitable vehicles in which to act out their thoughts. Demonic acts may be the result.

It may not be exactly as your friend perceives demons, but the answer is truthfully that demons do exist. They do find a way to penetrate into your existence.

You will only be affected by them if you are not in a place of wholeness, of integrity, of truth and love. They cannot come close to these energies. Light, love, truth, joy, happiness, laughter, song, prayer, serenity ~ these are all anathema to demons."