That article by Father Malachi Martin, author of over 25 books including Hostage to the Devil defines what that demonic condition is. I believe that condition is what we are dealing with in our current President.
From covering up crosses on stage in Georgetown and Notre Dame we he spoke, to omitting the words "God" or "Creator" from the Declaration of Independence speeches, to his open scorn for Christians "clinging" to the Bible, to his mocking of the bible (Video here) during campaign stops, there is little doubt there is demonic influence in his life. Whether or not there is total control by demons should be a subject for further scrutiny and debate.