If by "aliens" you mean: Biological life from somewhere else in the universe or even another dimension/universe, do I think that exists? The answer is no.
If by "aliens" you mean: Spiritual entities who deceive humanity into believing they are super-intelligent biological beings from distant places? The answer is yes.
I believe that the supposed alien entities visiting us are nothing more than fallen angels, demonic in nature. Just look at the messages that contactees publish in various media, and it all seems to directly contradict or otherwise subvert, the bible and in particular Jesus. Never will you find an "alien" that professes that Jesus is God Almighty in the flesh, and never will you find one saying we must accept the free gift of salvation by his sacrifice and resurrection.
You also will not find aliens even mentioning the name "Jesus" directly, and in almost every case where an abductee does mention his name, the "aliens" flee in terror or are in some way weakened. Now, if Jesus was just some Jewish guy who lived 2,000 years ago... Why would these supposed aliens be afraid of Jesus, or be weakened by the very mention of his name?
I did write a hub about this if you want to take a look at it. There are quite a few videos and articles about this out there on the web, and you should take as much of that into consideration as possible. I hope and pray for you, Omar. Jesus is the way, the truth and the life.