To be a little more informative they are trying (sucessfully) to breed out the qualities that make us human. Not only through their own efforts but with the help of humans. An analogy would be what we've done by genetically modifying things to make it our own. It's really just corruption of creation not creation itself. It used to be well known that we were dealing with other dimensional fallen angels/demons; now they try to hammer into everyones heads that they're extraterrestrial. Corrupting creation to the extent it was before the flood was an attempt at stopping the birth of christ because God wouldn't come here and enter a corrupted form. I wish God would just shut them in their dimension completely and not allow them to keep "hacking" out and screwing with us.