Ratty,
I define a Christian as someone who believes that he or she will attain eternal salvation through Jesus Christ. Severian has never heard of Jesus Christ, and he himself has brought salvation (through destruction) to Urth. How does that make him a Christian (please don't cite Wolfe's interview since he isn't here to defend what he actually meant, and I think we'd agree that he is tricky)? Perhaps you are using Christian in the old-fashioned sense of being a good person, or "one of us." I can't accept that, having known many good people of other faiths (or none). I can accept Severian as a Christ avatar, however.
(This really belongs in the other group, doesn't it?)
mantis,
May I have one of my four questions that didn't get used? Not the one about Hy's scarf---it's easy to see that only straightforward questions work. You can choose---want me to e-mail them?
-alga-