In the evangelical community, especially the more fundamentalist regions of it, one is taught from a very young age that the "spiritual world" is more real than the real world and that everyone knows this fact, at least subconsciously. People who treat Christianity as a reasonable thing that they just happen not to believe in are, of course, merely in denial.

That's probably one of those things that I always forget, not having been raised in a fundamentalist evangelical community. But you're right, attitude (and what is counted as "evidence") is very important, and maybe more important than whether mere facts are for/against a given hypothesis.