The bible was written when they didn't even know of planets, thought the sun revolved around the earth, thought the earth was flat and that heaven was in the clouds and hell in the center of the earth.
I'm not trying to nitpick you here, but today there's still so much about the universe we don't know, much like the Bible authors didn't know about planets. Off the top of my head I can't recall any scripture that refers the sun revolving around the earth, or the earth being flat, yet the was the predominant belief/ science at the time. Technically Christians still believe heaven to be in the "clouds" and the scientific community believes the earth to have a molten core at its center (fire and whatnot = hell).
I get why people don't like religious fanatics, and I understand how simple and closed minded religious people can be.
Croatch, Avxo and SF1900 , among many others here, have made some well thought out points in regards to religious nuts, and superstitions.
That said, and getting back to my main point the bible speaks of angels and demons (living beings) coming from heaven (an area where angels reside that's not of the earth, that the book of revelation offers dimensions of, something a smaller planet).
It's preposterous and foolish to insinuate that the authors of the Bible didn't believe in life on other planets, and a discovery of such wouldn't and shouldn't destroy a faith but only reinforce it.
Meltdown over