ANSWER: There is much evidence of "extraterrestrial life" but not necessarily living on other planets. The Bible states that at least 100 million living non-human creatures exist that are not earth bound: "Then I looked, and I heard the voice of many angels around the throne, the living creatures, and the elders; and the number of them was ten thousand times ten thousand, and thousands of thousands . . ." (Revelation 5:11, NKJV throughout).
Additional places in the scripture indicate that the amount of life that is not on the earth is innumerable (Hebrews 12:22). Some of these creatures have animalistic forms such as an ox, eagle or lion while others have a more humanlike appearance. Many of them have wings with multiple eyes (Revelation 4:6 - 8).
These beings have many times visited the earth (Hebrews 13:1 - 2). They visited the earth and met with Lot shortly before the destruction of Sodom and Gomorrah (Genesis 19). They talked and ate a meal with the great patriarch Abraham (Genesis 18:1 - 8). None of these life forms distorts the Bible's teaching about creation. In essence, they support it (see Job 38:4 - 7).
With this as a background, let us consider the question about beings on other planets. God (Christ) reveals himself as the creator of all, which means everything. He created our sun and every star that exists, some so far away they appear as points of light. He created the various island universes we call galaxies, which have hundreds of billions of stars. He created matter, gravity, force, energy, radiation, colors, angels, spiritual principles, and even time. He is the creator of all things and all thing exist because he has brought them into being (Colossians 1:12 - 13, 15 - 17).
Science has so far revealed (from a physical perspective) that NO living beings exist anywhere except on the earth. Science also reveals that living things can only come from existing living things. It cannot come from inorganic matter. If something is alive somewhere else then God himself would have created it. It would not have come into existence through evolutionary processes.
Life is extremely complex and from a scientific and mathematical perspective, earth probably contains the only living entities that exist in the cosmos. It is highly unlikely, probably impossible, that living creatures exist anywhere else. Evolutionary science is blind to all of the above, because they have rejected the knowledge of God.
From the view of the Bible, if life on other planets exists then God created it. If he created conscious, thinking beings, they would have served his purpose and would not distort the Biblical concept of creation. Instead, it would support his creation, since he would be the author of them and still have his purpose fulfilled.