God created Lucifer, he rebelled, he will be punished, he knows his days are numbered. He is the great deceiver, but he's not all powerful. Everything he does is limited by God. He had to ask God's permission to bring all Jobs trials. I don't find "alien" appearances as all that great but many today (and times past) actually summon demons, talk to them, and many humans have been actually possessed. I read that other post regarding aliens the other day, and the point was made that the aliens encourage witchcraft, worship or Satan, etc, which to me only confirms who they are and to whom they bear allegiance, Satan, the father of lies. Just my take.

As an aside, which I think also determines my worldview, after having grown up dispensationalist premillenial rapture, I am now postmillenial and believe God is establishing His kingdom on earth, and the demonic powers know their time is short, thus another push to deceive. Consider reading When the Man Comes Around by Doug Wilson, and Endtimes Madness by Gary DeMar. They don't discuss aliens/demons, but to me the object of aliens and infatuation with aliens has but one goal--to deceive people into believing a lie, God didn't make people or the universe, there are many life forms in the universe, we are NOT special, the Bible is bunk, etc.