Atheist Flutheronians, how would you handle it if your child believed man’s origin on Earth came by way of extraterrestrials?

Being an Atheist if your child rejected the belief that man was introduced on Earth by God, but instead was planted here by extraterrestrials similar to how we relocate wildlife how would you handle it? If they used UFO sightings and testimony from those believing they were abducted and examined the way scientist today tag, study, and release animals with some tracking device, would you find that you could plausibly support their thinking or belief? Would you see them as being as daft in the head as if they believed in God, or intelligent design?