If a church is "post-Christian," is it really still a church?

Dean Munday's excellent blog has a superb quotation from Mark Steyn's new book, America Alone: The End of the World as We Know It, wherein Steyn absolutely nails it in describing the decline of mainline Protestantism--and the Episcopal Church in particular. Representative excerpt-of-an-excerpt follows, but do read Dean Munday's longer selection. One question that this raises: if a church is "post-Christian," how can it in any sense of the word still be termed a "church"?

Most mainline Protestant churches are, to one degree or another, post-Christian. If they no longer seem disposed to converting the unbelieving to Christ, they can at least convert them to the boggiest of soft-left political cliches, on the grounds that if Jesus were alive today he'd most likely be a gay Anglican bishop in a committed relationship driving around in an environmentally friendly car with an "Arms Are for Hugging" sticker on the way to an interfaith dialogue with a Wiccan and a couple of Wahhabi imams.