C.S. Lewis’s Space Trilogy tackles this exact question.
The first book calls Earth “the Silent Planet,” which, if other life does exist out there, is a hauntingly beautiful way to frame our world.
I don’t think Christians have to pretend the question would be theologically simple if intelligent life were ever found. Christ became human in Adam’s line, and Scripture tells the story of God redeeming mankind, not every possible creature.
That doesn’t make aliens impossible though. It means being careful not to invent doctrines for beings God hasn’t introduced to us.
I went down a whole exoplanet rabbit hole after watching a documentary about planets in the ‘habitable zone.’ And I was unsettled for about a week.
What helped was realizing the Bible isn’t trying to catalog everything God made. It does tell us enough about His character to trust Him with what He hasn’t told us. Deuteronomy 29:29 was useful for me there. Some things are revealed so we can live faithfully, and some things are God’s business.
So enjoy the stars.