Bless you for an excellent meta "right under my nose" example.
I suspect (but can be convinced otherwise) that the OS will end up in fixed attitude because the manipulation was predominantly in the distant past. That is, the typical believer creates a fiction one time and then gets stuck in that fiction for the long term.
As opposed to that initial process in the past, now the main manifestations are things like righteousness (well-intentioned fixed attitude), dogma (don't question it, that would just be absurd, I'm not talking to you anymore), and having a dislike against a group with a label (perhaps without realizing it--e.g. don't tell me he's a ___ supporter!).
I meant "lying to oneself" in the way that Bob Ewell lied to himself about Tom Robinson and, more generally, about "how things should be" at some point in Bob's past. In other words, he evaded thinking carefully about what is essential about an individual (character, choices, behavior, etc) vs non-essential (race, parentage, melanin, etc).