You said it well, Scott, that he "lacks the authority to make this declaration."
We see the damage that is done by gatekeeper statements, but what has been hitting me lately is the smallness of the theological territories that some choose to inhabit. When I think of a faith that includes two millennia of vastly different cultures, languages, ethnicities, and social locations, I realize how little I know about my many sisters and brothers.
Why should we fear Christian diversity?