Again, by comparing an atheist's opinion with that of lack of belief in unicorns is not a really good comparison. But that's how I think, obviously not how you think. But now that you mention it, maybe something in the horse category did have a horn coming out of his head. Oh I checked. Better get rid of your analogy, because guess what?
Turns out, they looked way different than we thought.
www.goodhousekeeping.com
Scientists say unicorns existed!! Hey, look at that! Just not in the timetable I would agree to, but really -- hey -- they did exist!! (Say the scientists.) Get rid of that analogy now you can believe in -- unicorns.