Provide Scripture which says that these space aliens are either demonic or sent from God.
There probably aren’t any Scriptures directly referencing these, although by study of Bible doctrine, and then applying it to any situation within which we find ourselves, there always is a way to remain in fellowship with God and perform by His Plan in that situation.
The reports given by eyewitnesses tend to indicate these are creatures with an ability to communicate “telepathically” or perhaps more directly as spiritual persons. If they are indeed a class of angelic being, then these reports are consistent with them being spiritual entities.