I had a look and narcistically figure that you might be interested in my take - mine, mind, with no attempt to make general statements.
The story started with a hoot. Egan's prose is pleasant, and moreover he shows familiarity with integrating it with his non-prose: the jailbreak somehow manages to retain momentum even when it digresses, at length, into physics. Maybe I'm just geeky enough. What with my recent experience with Mary Sues, the woman with incredible powers and complete self-assurance that's never ever contradicted was a tad annoying, despite the reasons for those traits.
C.S. Lewis is then introduced reading a disturbing letter about ****ing up kids, and he reads it with growing satisfaction and a sense of vindication. He then muses on planting the seed of faith in children's minds. For a writer who goes into the applications of quantum gravity theory in the middle of a jailbreak, this carries a shade of having Lewis twirl his moustache and go "mwahahahaha!" I skipped forward some, and found a debate scene that consists of a smug yet clearly inferior argument and of the protagonist striking it down, an innocent victim who shows who the bad guys are by suffering because of their convictions, and finally a scene where the unfalteringly serene messenger of truth suffers the increasingly irrational ravings of the fool who refuses to face reality. I put the story down. All three of these are familiar tropes from works from Jack Chick's to Eragon, and they weren't any more palatable now than they were then. I find "raving fool vs serene messenger" the most annoying of the three - which may be beause of my previous encounters more than this one, I can't tell - though the innocent victim is distinguished by her sheer unnecessity. Some works just have the villain kick a dog.