Christian POV:

Aliens and UFO's are material apparatuses conjured up by immaterial beings (demons) to lead humanity astray. Either to worship them, scare them, or to validate the narrative that other life forms can "evolve" separate from us. There are many accounts of alien encounters ceasing when the subject cries out in Jesus' name. The government is slowly recognizing this as a narrative because they are Satanists and wicked people that hate God.