But... so what?
So you're mischaracterizing, and thus misunderstanding, one of the people you're trying to have a conversation with. I think that's counterproductive to the goals of actual conversation.
You might note that Zig's proposal isn't to define religion in general in this way, only to do so with respect to extraterrestrials. Whether or not that proposal clarifies more than it confuses, isn't obvious to me, but I do think that if you want to discuss that, it's worthwhile to do so on its own terms and understand exactly what he's saying.