Believers in Belief
Archived comment from this SR thread:
Let’s not forget to distinguish between what people believe, and what they believe they believe.
Plenty of people do not believe in a deity, who sincerely believe that they do.
One way to distinguish between them: it is commonly recognized at this point that people who know they are being observed by others behave differently than when they think they’re alone. People who believe they believe in deities who are supposedly persons usually act according to that pattern. If they genuinely believed, they would never think they were alone and wouldn’t follow the pattern.