The mission of a Christian congregation is, in one sense, simple: follow Jesus; be Jesus; do what Jesus did. And yet, every congregation is gifted and shaped by the power of the Holy Spirit in unique ways that make its mission unique. The mission of a congregation is indeed to be the body of Christ in the world, but that looks different from palce to place.
The whole mission of a place is summed up as its identity in Christ. There are four aspects to that identity:
Values - The way the congregation generally behaves as it carries out its mission - the actions you can see when the congregation is at its best.
Beliefs - The core of the faith we turn to when times are most trying, the hour at its darkest.