What logic are you applying? If I understand, according to you nothing is 100% sure. Even if I saw a leprechaun stealing my wallet, it's more likely that I'm wrong than that Leprechauns really exist.
What other options are there then? We're placed here by an alien race? Than you'd be just passing the ball on, because you can ask how did these aliens get there.
So eh, what do you believe then?
