Is 'faith' that Flying Saucers exist a good reason to believe in them when there's no hard evidence they exist?

Especially when faith could be placed in anything at all. How does God differ from Flying Saucers? There are all sorts of beliefs about who or what a god is & no one has any hard evidence that their definition is any better than any other one so why should 'faith' be considered meaningful in any way? Is 'faith' that Flying Saucers exist a good reason to believe in them when there's no hard evidence THEY exist either?