Aliens and demons

One is often exposed to stories and reports of encounters with aliens from outer space. I believe that most of these cases can be explained as hoaxes, mistaken interpretations of an experience, or someone wanting attention. Despite that, there are some instances in which an "encounter" cannot be completely explained away. Is it possible that demons could be at work in trying to deceive people by taking on the appearance of an alien, or the image that most people believe an alien would look like? I think it is within the realm of demonic activity for this to be possible. Am I wrong? Thank you.

I don’t believe you are wrong in suggesting that possibility—and that’s all it is, a possibility.  The Bible reminds us that “Our struggle is not against flesh and blood, but against the rulers, against the authorities, against the powers of this dark world and against the spiritual forces of evil in the heavenly realms” (Ephesians 6:12).  Satan is an enemy whose power exceeds our own.  His goal is to destroy faith in people who believe and keep others in unbelief (2 Corinthians 4:4).  There is no telling what Satan might attempt to do to carry out his goals.

Thankfully we are dealing with a defeated enemy, one whose head has been crushed (Genesis 3:15).  Jesus Christ shared in our humanity “so that by his death he might destroy him who holds the power of death—that is, the devil” (Hebrews 2:14).  By his holy life, death and resurrection Jesus has destroyed Satan, and it is only a matter of time before he is put out of commission entirely (Revelation 20:10).  Until that time, Christians like you and I carry out God’s instruction:  “Put on the full armor of God so that you can take your stand against the devil’s schemes” (Ephesians 6:11).  We do that trusting in God’s promise:  “Resist the devil, and he will flee from you” (James 4:7).