It would be selfish to deny the existence of another being in our universe. You can ask every sciencer the question if there is a other being in our universe,
and the answer would be yes.
Whether it is a creationist, ID or somebody who believes in (Darwin)evolution.
Where not alone, and that ain't a cheap X-file joke, but it's a fact. And there's numerous evidence for that.
The chance of life originating somewhere else is almost 99,99999...% Past civilisations has also reported that strange beings had come arrived from the sky, and they would be worshipped many years. It's the same idea over different communities in the past. Even nowadays the same story.
It's also proven that life can exist outside earth.
How big makes that the chance that humans fucked up once before and thrown to earth.
Not as exact beings, but enough DNA to start up life again. Were nowadays able to reconstruct ears on mice, for a higher civilizing that would be a piece of cake to calcute the exact needs for planet earth.
You find a similar story in the bible,
Arc of Noah preparing to survive with a bunch of basic animals.
Remember that the bible speaks for a great deal in metaphors, and not anything should be taken litterally.
Whether you believe in God or not, the bible also shows us an other message,
don't fuck up... again.