Taking the time to read the help guide and clicking on the help links next to every single thing on the nation help screen should be about enough to figure out things like national religion, national government, etc.
When it comes to more complex things like war, all the factors affecting population happiness, etc, then I can completely understand someone not getting it. But when something is practically spoon-fed to you in the help links and all it would take is a little reading to figure it out, and the person clearly hasn't bothered to do that, then I'm gonna get annoyed.