I also wouldn't generalize from this poster's anecdote to conclude "This is likely some cultural issue" in the US. I guess religion is a touchy subject in the US compared to more homoegenous nations like in the EU, and a rule of thumb I'd always heard is to avoid it in the office. (They used to say the same thing about politics in the office but that definitely went out the window these last 10 years.)
But then I'm not paranoid , and Ive never worked anyplace in 20 years where I feel people are being dishonest or disingenuous or playing any sort of games. especially not mind games, that's fucking absurd to me that you would even think that at all.
What sort of people are you working for, that sounds like hell.
I've always been in offices, and worked for managers I've gone and got drunk with and talked about all sorts of shit. it's never been an issue.
If US office culture Is as you describe it, it sounds fucking awful.
I think it’s about minimizing liability. I wouldn’t want a work dynamic to turn toxic due to a coworker’s prejudice or some disagreement we had debating over the water cooler. At work you focus on work, sure you can have some chit chat but generally these topics are breached after being acquainted with someone.
This is likely some cultural issue (I'm not from the United States), but I don't get what some person of power who loves debating religion at the water cooler makes the company a hostile work environment. Quite the opposite: in my gut feeling the fact that religion (a topic that has a tendency to cause heated discussions) can be discussed at the water cooler is rather a point of evidence that the work environment is really healthy.