The issue with poltics and religious discussions is they devolve quickly and often turn to snark, derision, shouting, and endless back and forth.
If the Coffee Shop is too much now, imagine a Trump and a Biden supporter going at the current news of the day!!!! (Not going there, just an example of how loud the coffee shop threads could become).
Does it matter if you post that you pastored church? Not at all, IMO. Or that your church groups responded to assist with disaster clean up? Nope.
But the proselytizing would probably lead to debate with those who don't follow the religion.
And, just like politics, those can get very noisy, and that becomes a turnoff.
Just like the restauranteur who asks a traveling steet preacher to leave a dining room when the preacher launches into full fire-and-brimstone in the middle of other people's dinner experience, a No Politics/Religion thread is designed to keep the politicos and the Jed Smocks of the world outside of the experience of others.
The time, manner, and place of those discussions matter greatly. Just as the restaurant manager/owner is within their rights to limit proselytizing and/or anything that can disturb the dining experience of their guests, forum owners/staff can do the same. Bob's forum. Bob's rules.
And, until yesterday evening, there were only two: Be Nice, no Politics or Religion discussion.