Your supernatural unicorn is nevertheless still a false analogy. NOBODY believes in it. People believe in God, whether they're wrong or right that belief means something. The unicorn thing is essentially nonsensical, because it's too specific. There ARE things that lead people to believe in the supernatural, but nothing that points to any aspect of this supernatural realm having anything to do with unicorns. No one claims to have been visited by a unicorn, but people do claim to have been visited by God, to have talked to God, to have seen God. It does not matter at all (at least for the sake of this argument) whether they're or lying or not. Simply by claiming these things, they distinguish a belief in god from these ridiculously pointless and falsely analogous beliefs in unicorns and spacewhales.