Nonbelievers Have Built-In, Shockproof, Shit Detectors

Astral Codex Ten:

[I]f someone tells you that people who don’t believe in God will believe in anything, please politely correct them that this is only true until the point where they 100% accept scientific materialist atheism, at which point they go back to mostly not being that gullible again.

Will Nonbelievers Really Believe Anything?