A guest post by commenter JMSmith:
When we say that Western Civilization is post-Christian, we do not mean that Christianity has become irrelevant. It will not be irrelevant so long as we continue to be defined in a vital way by our answers to the decisive question that Jesus posed to his disciples: “whom say ye that I am?” To this question three basic answers are possible. There is the orthodox Christian answer that he is the Son of the triune God, there is the infidel answer that he was a silver-tongued grifter, and there is the humanitarian answer that he was an exemplary human being and harbinger of what all men will one day become. We are post-Christian because the first answer is not so popular as it once was, but also because the question itself remains vital and decisive.
Today the humanitarian answer is the most respectable, and quite possibly the most popular. It avoids the offensive nastiness of the infidel answer and the metaphysical mysteries of the orthodox answer, so it appeals to people who aspire to be nice and normal. Moreover, it carries the flattering implication that these nice and normal people are also more than a little Christ-like. The question is, are they Christian?