"Most church-goers conceive of church as a building. On Sunday mornings they get up, get dressed, and “go to church.” However, this is not how the early Christians conceived of church. They did not go to church—they were the church. Church is a community, not a building or a meeting. Church is all week, not just on weekends. Church literally means a “public assembly of people.” It has to do with people gathering, not with program-participating."
Jonathan Dodson, The Church: A gospel centred community (read the full thing here)