By the term “aliens” let’s assume beings capable of making moral choices, having intellect, emotion, and a will. First, a few scientific facts:
Men have sent spacecraft to every planet in our solar system, except Pluto. After observing these planets we have ruled out all but Mars and possibly a moon of Jupiter as being able to support life.
In 1976, the U.S. sent two landers to Mars. Each had instruments that could dig into the Martian sand and analyze it for any sign of “life.” They found absolutely nothing. If you dug from the most barren desert on earth, or dug through the most frozen dirt in Antarctica, and analyzed the soil these, it would be teaming with micro-organism life! In 1997, the U.S. sent “Pathfinder” to the surface of Mars. This rover took more samples and conducted many more experiments. It also found absolutely no sign of life. Since that time, several more missions to Mars have been launched. Expect the same results.
Astronomers are constantly finding new “planets” in distant solar systems. Some propose that the existence of so many “planets” proves that there must be life somewhere else in the universe. The fact is, none of these “planets” have ever been proved to be anything close to a life-supporting planet. The tremendous distance between earth and these planets makes it impossible to make any judgments regarding their life-sustaining possibility. Knowing that only Earth can support life in our solar system, evolutionists want very badly to find another planet in another solar system to argue that life must also have evolved out there somewhere. There may be other “planets,” out there somewhere, but we certainly know nothing intimately about them to verify if they could even remotely support “life.”
**So, what does the Bible say? **The earth, and mankind, are unique in God’s creation. Genesis 1 teaches that God created the earth before He even created the sun, the moon, or the stars. Acts 17:24, 26 states that "God, who made the world and everything in it, since He is Lord of heaven and earth,… has made from one blood every nation of men to dwell on all the face of the earth, and has determined their pre-appointed times and the boundaries of their dwellings."
After creation, mankind was without sin and everything in the world was “very good” (Genesis 1:31). When the first man sinned (Genesis 3) it caused the fall of mankind, which resulted in problems of all sorts, sickness, and death. Even though animals have no personal sin before God (they are not moral beings) they nevertheless suffer and even die (Romans 8:19-22). Jesus Christ died to remove the punishment that we deserve for our sin. When He returns, He will undo many aspects of the curse that has existed since Adam, and ultimately He will remove all aspects of the curse (Revelation 21-22).
Note that Romans 8:19-22 states that all of creation eagerly waits for this time! It’s important to also note that Christ came to earth to die, that He came to earth to die for mankind, and that He died only once (Hebrews 7:27; 9:26-28; 10:10).
Putting these truths together concisely: God created the earth and mankind unique. All of creation suffered as a result of the fall of man. Christ came to earth to offer Himself once and only once to pay for our sins. Not only will believers be delivered, but all of creation will be delivered as well.
Implications: If all of creation suffers, that means that any life apart from earth would also suffer. If, for the sake of argument, there exists moral beings on other planets, then they also suffer; and if not now, then someday they will surely suffer when everything will pass away with a great noise, and the elements will melt with fervent heat (2 Peter 3:10). If they had never sinned, then God would be unjust to punish them; but if they had sinned, and Christ could die only once (which He did on earth) then they are left in their sin, which would also be against the character of God (2 Peter 3:9). This leaves us with an unsolvable paradox . . . unless, of course, there are no moral beings outside of earth.
What about life forms on other planets that are non-moral and non-sentient? Could algae or even dogs and cats be present on an unknown planet? Presumably so, and it would not do any real harm to any biblical text. But it would certainly prove problematic when trying answer questions like, "Since all of creation suffers, what purpose would God have in creating suffering non-moral and non-sentient creatures on distant planets?
In conclusion, the Bible gives us no reason to believe that there is life elsewhere in the universe. In fact, the Bible gives us several key reasons why there cannot be. Yes, there are many strange and unexplainable things that take place. There is no reason, though, to attribute these phenomena to aliens or UFOs. If there is a discernable cause to these supposed events, it is likely spiritual, and more specifically, demonic in origin.