If you want to understand a human being or the human condition, what is the single most important question you should ask? Most religious people would probably ask, "Do you believe in God?" The most important question most secular people, especially progressives, could imagine asking is probably a policy question. Today it would be "Do you support Donald Trump?" Otherwise it might be "Do you support abortion rights?" or "Do you support gay marriage?" As important as all of these questions are, in attempting to understand human beings, especially large groups of human beings -- i.e., their society -- the...