The Rob Bell flap over his views of Hell in “Love Wins” raises an interesting question. Many objected to Bell being criticized, because to them, Hell is not something we know a whole lot about, and our beliefs about the afterlife are not “essential”. So, to some, saying or implying that Bell is “out of bounds” is judgmental and wrong.
A similar question is raised by Roger Olson, who suggests that some Mormons that Mormons maybe could be considered Christians if they accept certain things about Jesus.
Augustine’s famous dictum, “on essentials, unity; on non-essentials, liberty; and in all things charity” can only guide our behavior if we have a consensus on what is essential.