What is the religious defense of this Jesus Christ quote?

[Belacqua]

The Genesis creation myth, and the Noah flood myth, are two examples that not only contain risibly erroneous claims, but whose core message is contradicted by objective scientific facts.

Here of course you're assuming that you know what the "core message" of these stories is, and that this is something that can be contradicted by objective scientific facts. 

Myths, allegories, etc., carry a core message that is not dependent on the scientific accuracy of the story. 

Do you have some historical evidence that the stories are intended as literally true? Many Christians (e.g. Augustine) assume that their purpose is something other than reportage.