jhuffman comments on Undiscriminating Skepticism - Less Wrong
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Two more non-trustworthy indicators:
Ask the person in question which of the several ridiculous ideas they reject they find least ridiculous - for example "Which do you think is more likely to be true - astrology, or UFOs?" I've found people trying to signal affiliation have a hard time with this sort of question and will even be flustered by it, saying something along the lines of "They're both stupid" or "Is this some sort of trick to make me sound like I believe a crazy idea?". A rationalist will say something more like "Well, I don't believe either, but UFOs at least make sense with our idea of the universe, whereas astrology is just plain crazytalk" (or ze may refuse to answer on the grounds that you're wasting zir time; it's not a perfect test).
Observe the circumstances in which the person involved brings up the belief. If they just go to atheist forums and say "Man, those religious people sure are stupid," higher probability of signaller. If they actively talk to religious people, try to use atheism as a starting point for building new ideas, and don't bring it up much when it's not relevant, higher probability they believe it for the right reasons.
I wouldn't answer the astrology/UFO question. Extraterrestrials visiting in flying human-vehicle-sized ships from human-visible distances is so horribly anthropomorphic as to make it immeasurably improbable. Both propositions are far less likely than me winning the lottery, and that's the best I can get from my wetware. Anything further is like asking, "Which are you more certain is a European country, France or Spain?"
Also, I'm inclined to avoid questions of this form on principle. It's like Yudkowsky's "blue tentacle" in Technical Explanation: Being able to find outs for a theory that doesn't fit evidence is anti-knowledge, and the more practice you get at it the crazier you become.
UFOs are possible given what we know of the universe. Unlikely, yes, but its possible to have them without us learning much new about the universe. Astrology, not so much. Astrology means we have totally whiffed on science and have to integrate all the contradictory information we have in ways that are unimaginable.