On August 5, 2010, both BBC News and the Telegraph reported that during World War II, Winston Churchill ordered a cover-up of an encounter between a UFO and a RAF bomber because he feared public panic and “loss of faith in religion,” according to files released from the British National Archives
Some people think that the very existence of UFOs or extraterrestrials would demonstrate that Christianity could not be true. But nobody has ever demonstrated why or how the existence of aliens would mean that Christianity is false. In December of 1960, there was a report from the Brookings Institute on the potential effects of the disclosure of the existence of extraterrestrial life (Proposed Studies on the Implications of Peaceful Space Activities for Human Affairs, submitted to the House Committee on Science and Astronautics of the US House of Representatives in the 87th US Congress on April 18, 1961). Contrary to popular belief, this report made no statements to the effect that the existence of extraterrestrial life would be incompatible with Christianity, nor did it indicate that such a disclosure could undermine Christian faith. Rather, the Brookings Report made speculative comments regarding general public reaction to any discovery of extraterrestrial intelligent life, without specifically mentioning faith or Christianity.
But—what if it really did become evident at some point that aliens actually do exist? Well, how in that case could it ever be proven definitively that such aliens were not demons? And even if not, if these entities were to say that Christianity is false, on what basis other than pure trust could they be believed? Such claims or “revelations” could never constitute infallible evidence overturning Christ’s claims about Himself as recorded in the New Testament.
In any case, Winston Churchill was wrong. Christians recognize that God is completely sovereign over all circumstances. Therefore they do not fear threats, whether from rogue governments, aliens, time-travelers, inter-dimensional travelers, some future dictatorial anti-Christian new world order, supposed changes in the space-time continuum, demons, Satan, Satanists, or anyone or anything else. Christians are well aware that through the shed blood of Jesus Christ, they have complete authority over all of these things and more, no matter who or what they are, and they know full well that regardless of anything else, their lives are totally in God’s hands. The lives and deaths of all of the Christian martyrs throughout the centuries have proved this beyond the shadow of any doubt.
rmriss 
God is indeed sovereign. And as Christians, we need not fear any principalities or kingdoms, including extraterrestrial ones. Nor do I believe any extraterrestrial life forms exist, despite mankind’s repeated attempts to prove they do.
The notion that intelligent life exists outside our own planet invariably starts from the worldly assumption that we can’t possibly be all there is. Carl Sagan personified that idea, starting with the premise that we are but a speck of existence on a speck of a planet in an endless ocean of solar systems and galaxies.
But starting from a biblical premise we know this: Christ was a particular person (human/divine) born in a particular place at a particular time for a particular purpose. From the Bible we know we are the pinnacle of God’s creation, and there is nothing in all of scripture, which we consider inerrant, to indicate that there is life outside of planet earth. To postulate as Carl Sagan and others have that to consider that we’re it is simply egotistical and arrogant is to give short shrift to God’s purposes in His design of all creation.
As 1 Corinthians 13:12 says, in part, “…then we shall know, even as we are fully known.” So while we perhaps cannot know with certainty now, a biblical approach to the notion of extraterrestrial life would seem to suggest that continuing to search for it is likely a monumental waste of time and money.