The extraterrestrial phenomenon will be used to deceive mankind into believing that we were seeded on earth by extraterrestrials instead of God. They will promote the ancient mystery schools that were adopted by most cultures as a source of divine wisdom. These schools promote enlightenment, a belief that a person can transcend the physical through illumination of the minds eye to become divine. This will be done to convince mankind that they do not need to be saved from their sinful nature by repentance and acceptance of Jesus Christ. This is why Christ warned many would try to climb into heaven by other means.
John 10-1 Verily, verily, I say unto you, He that entereth not by the door into the sheepfold, but climbeth up some other way, the same is a thief and a robber.