When most people in the world think of a "church," they think of a building. The Greek word ekklesia, which is most often translated as "church" in the Bible, never refers to a building, but always a group of people. The church is not a building: this is a message which requires proclamation to the world and reinforcement among the people of God.
The Church Is Not a Building | Musings on the Local Church | Sermon Outline
(Sermon, ironically, delivered in a meeting of the church in a home since the Senior Center was unavailable that day)