One of the sharpest shifts in our society recently is that the average person on the street now knows nothing about the Bible. When I was a kid, even the "unchurched" (I'm not a huge fan of that term) knew basic Bible stories and a few verses.
Today, though, people only know ONE. "Judge not, lest ye be judged."
But what does that really mean? Stephen Altrogge wrote a great post on the topic, which I highly recommend. You can find it here: Judge Not Lest Ye Be Judged.