Being the church is being missional

Keith at under the acacias recently looked at Acts 2 and reminds us of the centrality of Christian mission:

This central feature of the coming of the Holy Spirit at Pentecost - the proclamation of the wonders of God in other languages to people “of every nation under heaven” tells us something. Its message is that we are and must be a missionary people. Our identity is inescapably tied up with mission. We are not only the recipients of his grace, but the channels of it to the world. When we are not missionary, we are not the church.

That final sentence is a harsh assessment, isn't it? It's also true, I think. So how about it? Are our congregations missionary?