At this point, I see a lot of variance between what different people think the average imperial citizen should know about anything.
Sometimes I wonder if its better to basically say "here's the primer i feel the inquisitor would give his acolytes when they entered service" because the average or median imperial citizen a menial laborer with no schooling and half the time not even literate. You have to figure out what you want players to know in character, but the more easily found fluff that's denied by fiat of "standard imperial citizen" the more likely people are going to meta-game around it, intentionally or not.
It could also be a sign of my limited ability to separate myself from my characters and mean I'm a bad roleplayer when i can't willingly disbelieve what i see and hear described to me based on the idea that my "character" shouldn't know what they are seeing... considering i got told to stop meta-gaming, when I was not even trying to. I don't know what to do then.
Problem is not about what can acolyte know. Acolyte can know anything. And as I recall any hiver at least (and vast majority of Imperial citizens are hivers) counts as literate.
Problem is what are people around acolytes know.