The bible doesn't teach that there are UFO's (material flying objects). It also does not teach demons can manifest themselves as material objects.
Some people say ... and even some in government and/or the military say they have seen them and/or actually have physical evidence of such.
As a Christian ...
What do you believe about the existence of UFO's and why?
If you believe UFO's (material spaceships) is true .... how do you reconcile that with scripture?
What do you believe in this regard?
There is a strong belief that some form of advanced alien life, is out there.
However, I believe that the creator of everything has told us the truth about life in existence.
God says, at Psalm 115:16, "The heaven,
even the heavens,
are the LORD’s; But the earth He has given to the children of men."
God also inspired his servant Paul, to write at1 Corinthians 15:39-49
39 All flesh is not the same flesh, but there is one flesh of mankind, another flesh of animals, another flesh of birds, and another of fish. 40 There are also heavenly bodies and earthly bodies, but the glory of the heavenly is one, and the glory of the earthly is another. 41 There is one glory of the sun, another glory of the moon, and another glory of the stars; for star differs from star in glory.
42 So also is the resurrection of the dead. It is sown a perishable body, it is raised an imperishable body; 43 it is sown in dishonor, it is raised in glory; it is sown in weakness, it is raised in power; 44 it is sown a natural body, it is raised a spiritual body. If there is a natural body, there is also a spiritual body. 45 So also it is written: “The first man, Adam, became a living person.” The last Adam was a life-giving spirit. 46 However, the spiritual is not first, but the natural; then the spiritual. 47 The first man is from the earth, earthy; the second man is from heaven. 48 As is the earthy one, so also are those who are earthy; and as is the heavenly one, so also are those who are heavenly. 49 Just as we have borne the image of the earthy, we will also bear the image of the heavenly.
So, I believe any sightings of UFOs, or aliens, would be a product of one of the two life-forms God created - spirits, or flesh.