Fair point, i used the word conceptual to encapsulation the notion of the "true and original meaning" which it itself is very debatable. I think what would have been interesting for the author to show is "concepts" which some christian believe to be biblical but are not(at least in his point of view). But to compare the absence of the word "christianity" whilst the word "christian" is present, is a bit shallow cause the idea of having christlike folks is there, hence the author himself is being bit hung up on wordary vs exposing a genuine mismatch in core biblical "concepts".