There is an incredibly complex number of variables that have to line up right for life to be able to exist. It is so complex that it is evidence for design, so even secular scientists have been faced with the issue of the existence of God. Some have resorted to absurdity to argue against it. One theory is tht there are parallel universes like in the Superhero comic books. If there were an infinite number of universes, the statistical probability of life existing becomes less of an issue for them.
I saw a documentary that argued that our solar system is in the middle of the observable universe, surrounded by concentric circles (or spheres?) of clusters of galaxies. If God made other intelligent life on other planets, He still chose to send His Son as a Man to die once for Mankind, not as a Klingon....or whatever...to die and rise again.
I am of the opinion that many of the encounters with alleged space aliens are actually encounters with demons. I saw a program from Hugh Ross, an astrophysicist and pastor, who has interviewed numerous people who have had encounters with UFOs. In his experience as a grad student, he clocked hundreds of hours looking at the sky. Certain individuals would come in and see UFOs after a brief time looking into the telescope. He came up with the hypothesis that seeing UFO's probably had more to do with the individuals than with what was in the sky. These individuals were involved in the occult.
Later, he found in interviewing those who claimed encounters with UFOs and aliens, that the more intense an individual's experience with the occult was, the more intense of a UFO encounter they had. Most encounters could be explained by natural phenomenon, government aircraft, weather baloons, reflections of chandiliers in the window, etc. But those that could not usually involved someone who was into the occult. The ones who actually saw and spoke with the aliens were typically very much into the occult. Also, during the Cold War, the Russian government encouraged their scientists to experiment with the occult. He said that some of them were demonized. Back in the 1980's, I think it was, he spoke to some Russian scientists, and he said 10 or 15 of them were demon-possessed, probably through their occult activity, and screamed curses against Christ while he went up to speak. He had some pastors pray at the next meeting, and the demonized scientists were silent.
On one of his shows on Christian TV in the 1990's, Reasons to Believe, he said that two agnostic scientists, one of whom gave a report to Congress on UFO activities, concluded that accounts of encounters with UFOs were similar to if not identical to accounts of encounters with demons.