“Do you think Ephesians 6:10-18 is just God joking around?”
Not one word about demons flying around in crafts.
Demons are disembodied spirits and cannot contact physical objects directly, and cannot build physical crafts in which to fly around. In the Bible, they hunt around for bodies to possess.
However, it is highly doubtful that UFO aliens would be sent here by God. And it remains to be seen just how much Jesus will allow them to interlope, since he has been given complete authority on the Earth.
Really.
What credentials do you have as a demon expert because you sound like you are 13.