Two Questions From the Grave, by Antony Flew and Carl Sagan

Read and respond to two similar stories, one by Antony Flew, and the other by Carl Sagan. They both have to do with the OTF:

Antony Flew, in his classic Parable of the Invisible Gardener, asks this question:
At last the Sceptic despairs, "But what remains of your original assertion? Just how does what you call an invisible, intangible, eternally elusive gardener differ from an imaginary gardener or even from no gardener at all?"...What would have to occur or to have occurred to constitute for you a disproof of the love of, or the existence of, God?
Carl Sagan wrote about The Dragon In My Garage and asked:
Now, what's the difference between an invisible, incorporeal, floating dragon who spits heatless fire and no dragon at all? If there's no way to disprove my contention, no conceivable experiment that would count against it, what does it mean to say that my dragon exists?

Well, what of it?