Thank you for the source! (I'd upvote but have a negative score.)

If you interpret the story as plausibly as possible, then sure, the talking snake isn't that much different from a technologically superior species that created a big bang, terraformed the earth, implanted it with different animals (and placed misleading signs of an earlier race of animals and plants genetically related to the ones existing), and then created humans in a specially placed area where the trees and animals were micromanaged to suit the humans needs. All within the realm of the possible.

But, the usual story isn't that it was created by technological means, but by supernatural means. God is supposed to have created the world from some magical ability. So, to criticize the christian story is to criticize it as being magical. And if one finds it difficult to believe one part of that story, then all parts should be equally contested.

Regarding Yvain's point - I think it is true that one could just associate "stories about talking animals" with "other stories about animals that everyone knows are patently false" and then not believe in the first story as well. But, it is not just in the mind's map of the world that this connection occurs, because the second story is connected to the world. That is, when one things about Aesop's Fables you know (though not always consciously) that these stories are false.

So, to trigger the mind to establish a connection between Eden and Aesop, the mind makes the connection that "Stories that people believe are false", but the mind has good arguments to not believe in Aesop's fables, because there aren't any talking animals, and if that idea is part of knocking down Eden, then it is a fully rational way to dismiss Christianity. Definitely not thorough, and, again, it's maybe not a reliable way of convincing others.