I do believe that there are some kind of phenomena that some people see and that get called UFOs, that are the work of demons. I believe they are an illusion created to deceive. Some Christian teachers, for instance Scott Johnson whose studies are at Sermon Audio.com, believe they are increasing as we approach the last days because they will play a part in the Antichrist's deception. Some of his teachings are pretty far out but if the Antichrist is going to be able to do signs and wonders that truly dazzle the world, and nearly deceive the elect, we should be willing to consider the possibility of satanic tricks well beyond our usual expectations.