A fact only comes about when faith or belief is tested and comes back true. I remember reading in a school book once, that people believed flies came from rotting meat, and until someone tested this theory extensively, did they find that flies don't spawn from meat, but rather they lay eggs on the meat. Many times the things not seen are the most real. I personally haven't been to Michigan, though I've talked with people who have, and seen it on maps/pictures etc. I believe it exists, even though I've not seen it myself.
I think religion ties into this idea as well. People always want "proof" of a God, or whatever, and even when proof abounds, they still don't believe it because they haven't seen it. Just because I haven't seen Michigan doesn't make it any more or less real, and even if a group of radicals was to come up and claim that Michigan doesn't exist with "proof" for this claim, doesn't make it any more or less real. It's just easier to believe that Michigan is real, because we have satelites/pictures/more physical evidence in its favor. But for things of spiritual nature, we need spiritual proof. This is personal witness to an individual, and not as easy to share as a road trip/satellite picture, and because it needs to be felt personally, and not experienced with the 5 senses, people disregard it as naught.
Wow, I went off on a tangent with this one, haven't I?