If someone asks you whether or not you believe that unicorns exist, do you say "I don't know" or do you say, "No. I don't believe in them"? What about elves? goblins? What if someone asked you if you believe there's a planet somewhere where everyone looks like Cookie Monster and sings Beach Boy songs? Would you say, "I don't know"?
(109) Since we can't know 100% of the knowledge of the universe, what are the grounds for atheism? - Quora Saturday, December 28, 2013 @ 5:20pm
I wouldn't.
But I haven't been everywhere in the universe. It's POSSIBLE such a planet exists. I just have absolutely no reason to believe it does.