The assertion that aliens are demons could fit quite nicely with the doctrine of the rapture (here is another item for debate - pre, mid, or post
tribulation rapture).
Assuming a pre or mid tribulation rapture, the demons (masquerading as aliens) make their world wide appearance after the rapture. They tell the
world not to worry about the disappearance of all those Christians. They, the aliens, are responsible. The disappeared Christians were beamed to a
different world by use of the "aliens" fantastically advanced technoloy. The reason being that those Christians could not deal with the presence of
the aliens. But don't worry they are quite happy in their new world (those dumb Christians think they are in heaven). Several Christian writers
have stated that Satan will generate a lie to lay claim to the rapture. Well here might be his lie, the "aliens did it" because the Christians
could not bear the presence of the coming age of mankind.



but then again, they just use manipulation and control to gain power, which seems just as bad as what some aliens are demonstrating. i don't
think that makes them all "demonic", though. 
