"Christianity" is a myth

"Christianity", says Belloc, was a name invented in recent history.  No Christian in the first 1500 years of the Church's existence would have said "I believe in Christianity". He might have said I'm a Christian.  But there was no such think as an abstracted set of ideas divided neatly into essential and non-essential propositions.  There was the Church, and the rest: the heretics, the schismatics, the Jews, the Muslims, and the pagans.   So, it's best not to say that we live in a post-modern culture, or a post-Christian culture.  Rather, and of the essence, we should say that we live in a post-Church culture.  The Church no longer builds, guides, and leads our culture.