You heard Mark's voice both before and after he died? Did you know him personally? If not, its very likely that these are not real people. Try talking back to the voices. If they never say anything creative, you might have created them out of your fears. See if they might represent an emotional trauma of yours that you refuse to accept or deal with.
If they're real, its nothing to be afraid of or let run your life. From what i know, ghosts are in an unstable state, needing attention and energy from the living to stay there longer. What better way to get attention than to claim to be satan? Don't believe it, and call his bluff. If you ignore them long enough, they might go away on their own. If they don't, its because they share a similar emotional problem that you do. Once you overcome your own problem, they can no longer stay attatched to you.
Good luck!
-Person
If they're real, its nothing to be afraid of or let run your life. From what i know, ghosts are in an unstable state, needing attention and energy from the living to stay there longer. What better way to get attention than to claim to be satan? Don't believe it, and call his bluff. If you ignore them long enough, they might go away on their own. If they don't, its because they share a similar emotional problem that you do. Once you overcome your own problem, they can no longer stay attatched to you.
Good luck!
-Person