In response to the first question posed to him, Mark Driscoll answered thus:
Like all of my writing, this project was born out of my work as one of the elders at Mars Hill. We have enjoyed an ocean of God’s grace at our church. As we expand to more campuses, states, and possibly even nations, I wanted to do all I could to ensure doctrinal fidelity and clarity for our church. As the tree grows and the fruit increases, the roots need to sink deep as well. So, when our attendance was at about six thousand people a few years ago, we did something unprecedented. We canceled out the membership of everyone in our church and I preached the Doctrine series for thirteen weeks. Each sermon was well over an hour and included me answering text-messaged questions from our people.
Pastor Driscoll continues,
Those who made it through the entire series were interviewed, and those who evidenced true faith in Christ and signed our membership covenant were installed as new members. We had always had a high bar for membership, but I wanted to raise that bar higher as we pursued our goal of becoming, by God’s grace, a church of fifty thousand. In so doing, we lost about a thousand people, dropped to five thousand total, and missed budget for the first time in our church’s history. We then rebounded over the next few years to ten thousand people a week and as many as thirteen thousand on our peak weekend. We had pruned, which hurt, but then we harvested, which was healing. It’s not all about the numbers, and we were willing to lose a lot of people, but God proved that there is power in the gospel and that a people united around core biblical doctrine can be used by God to bear much fruit by grace. We now use the book and its small group questions as our membership process for Mars Hill. (read more, emphasis added)
Now this is what you call Radical Discipleship—ensuring that all your members are on the same page on key doctrines.
Apparently for Mark Driscoll and the Mars Hill Church, the Lord honored their radical approach to discipleship by adding thousands—actually exceeding the thousand they had lost.