The Catechism in Questions & Answers

366. What does “church” mean with respect to faith?

In reference to faith the term “church” does not refer primarily to the church building, but to the institution that has the function of imparting salvation in Christ to human beings. Those people who belong to the church are called to have eternal fellowship with God. Beyond that, “church” denotes the fellowship of the believers with the triune God already in the present, in that He turns to the believers, who bring Him worship and praise, in word and sacrament. In the church, the believers have fellowship with one another. The focal point of church life is the divine service.