If the earth is flat and the geocentrical worldview is correct and we live under a dome, then there's nothing apart from God, humans, animals, good angels and bad angels (=demons) existing. There are no extraterrestial beings from somewhere in outer space existing in the flat-earth-geocentric worldview.
Therefore, the alien-encounters must be of demonic origin or human origin. The fact, that alien-abductions can be stopped in the name of Jesus proves further, that those are spirtual encounters with demons. More Information concerning the fact that alien abductions can be stopped in the name of Jesus can be found on http://www.alienresistance.org/ce4.htm
The Big Secret in UFOs - Jesus Stops Alien Abductions