An excellent answer to this question as extracted from “got
questions.org”
**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 “the God who made the world and everything in it is the Lord of heaven and earth and does not live in temples built by hands…he made every nation of men, that they should inhabit the whole earth; and he determined the times set for them and the exact places where they should live.”
Originally, mankind was without sin, and everything in the world was “very good” (Genesis 1:31). When the first man sinned (Genesis 3), the result was problems of all sorts, including sickness and death. Even though animals have no personal sin before God (they are not moral beings), they still suffer and die (Romans 8:19-22). Jesus Christ died to remove the punishment that we deserve for our sin. When He returns, He will undo the curse that has existed since Adam (Revelation 21–22). Note that Romans 8:19-22 states that all of creation eagerly waits for this time. It is important to also note that Christ came to die for mankind and that He died only once (Hebrews 7:27; 9:26-28; 10:10).
If all of creation now suffers under the curse, any life apart from the earth would also suffer. If, for the sake of argument, moral beings do exist on other planets, then they also suffer; and if not now, then someday they will surely suffer when everything passes away with a great noise and the elements melt with fervent heat (2 Peter 3:10). If they had never sinned, then God would be unjust in punishing 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 contrary to 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 the earth.
What about non-moral and non-sentient life forms on other planets? 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 non-moral and non-sentient creatures to suffer 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 to be spiritual, and more specifically, demonic, in origin.**