Extracts from Against Christianity by Peter J. Leithart (Canon Press, 2003, pp.16-18)
Christian community...is not an extra "religious" layer on social life. The Church is not a club for religious people. The Church is a way of living together before God, a new way of being human together. What Jesus and the apostles proclaimed was not a new ideology or a new religion, in our attenuated modern sense. What they proclaimed was salvation, and that meant a new human world, a new social and political reality.
They proclaimed that God had established the eschatological order of human life in the midst of history, not perfectly but truly. The Church anticipates the form of the human race as it will be when it comes to maturity; she is the "already" of the new humanity that will be perfected in the "not yet" of the last day. Conversion thus means turning from one way of life, one culture, to another. Conversion is the beginning of a "resocialization," induction into an alternative paideia, and "inculturation" into the way of life practiced by the eschatological humanity.
In the New Testament, we do not find an essentially private gospel being applied to the public sphere, as if the public implications of the gospel were a second story built on the private ground floor. The gospel is the announcement of the Father's formation through His Son and the Spirit, of a new city the city of God...
We have made the Church strange and alien to the world, as if she were of a completely different order than the institutions of common social and political life. Paradoxically, the result of this estrangement has been to reshape the Church into the image of the world.
The Church is strange: she is the creation of the Father through Word and Spirit, the community of those who have been united by the Spirit with the Son, and therefore brought into the eternal community of the Trinity. She is a city whose town square is in heaven. She is a city without walls or boundary lines, a polity without sword or shield. Of no other society can that be said.
But she is ordinary: the Church is made up of human beings, with features that identify her as a culture among the cultures of the world. God did not enter a world of books with blurks; He did not intervene in a world of rituals and meals with spatuals and gleals; He did not call His people to live according to specific quormal principles or to promote a particular uphos.
Rather, God created a world of stories, symbols, rituals, and community rules. Into this world of stories, God introduced a rival story; into a world of books, God came with His own library; in a world of symbols and rituals and sacrificial meals, the Church was organized by a ritual bath and a feast of bread and wine; in the midst of cultures with their own ethos and moral atmosphere, God gathered a community to produce the aroma of Christ in their life together.
Only by insisting on the Church's ordinariness can we simultaneously grasp her strangeness.
The Church can cut across the grain of existing human social and cultural life only if she bears some likeness to existing societies. If she is a completely different sort of thing, then societies and nations and empires can go on their merry way ignoring the Church, or, equally deadly, find some murky alleyway to push her into.
But if the Church is God's society among human societies, a heavenly city invading the earthly city, then a territorial conflict is inevitable...