In his talks, Mike Frost says that we should explore what it looks like to make mission the organising principle of the Church. The most important reason for this is biblical – the sending God.
But there is another important reason: our times require that we organise around mission.
It was probably pretty obvious to the early Church that they needed to organise around mission – that’s why they grew so fast.
It’s pretty obvious in many parts of the world today that we need to organise around mission.
But for the past fifteen hundred years or so, it hasn’t been so obvious in the western world. In the world of Christendom, the Church occupied a privileged place at the centre of society. Pretty much everyone was baptised in church. The vast majority were married in church… and in due course buried in church too. Even people who didn’t believe were ‘Christian atheists’ – the God they did not believe in was the God of the Bible.
In the world of Christendom, we didn’t have to worry about mission so much, because large numbers of people ‘went to church,’ and even those who did not knew where to find us.
But we aren’t in Christendom any more. For something like 90% of the people around us, the Church is a massively irrelevant non-event. And an approach that waits for people to find us, or that invites them to come in to our buildings and our services to hear the Good News on our terms… just doesn’t cut it.
In a post-Christendom world, we need to organise around mission, or we will die. It is as simple, and as stark as that. And (like you) I know of plenty of churches today who are choosing death over discomfort.
There’s so much more I could say about this, but once again, other people have already said it, and have said it better than I could.

One of the best is Stuart Murray Williams, in his two books ‘Post-Christendom‘ and ‘Church after Christendom.’ (I don’t agree with everything Stuart says – especially with his views about the atonement. But on the subject of post-Christendom, no-one else gets near him.)

Other good places to look for a discussion of Post-Christendom are Mike Frost’s book ‘Exiles,’ and Alan Hirsch’s book ‘The Forgotten Ways.‘ Both of these have good short sections on this.