Even if the entire world consisted of nothing but like-minded evangelical Christians, this world would not be a Utopia. Not even to all those billions of like-minded evangelical Christians. Jews have had to hang together (lest they hang separately) for 2,000 years now -- and yet there's an old joke that goes like this:
Q: What do you get when you put ten Jews in a room together?
A: Eleven opinions.
Human beings are often irrational and rarely consistent. We slaughter one another over historical trivia, we annoy each other by whistling bad melodies for no good reason, and we