This book is about how we do church. More specifically, it is about the need to reinvent or change the church in order to make it more attractive and welcoming to the culture where it is planted.
The book contains some very challenging and helpful information for church planters/pastors/leaders and local church mission teams. For example, the authors begin with a helpful picture of the U.S. changing "glocal" (global/local reality) culture and practical steps to identify the unreached/unchurched people in their community. I also appreciate the emphasis on discipleship and the acknowledgement and warning that we an actually attract a crowd without having a church.
Every church should continually examine human imposed traditions and customs, which can cause a church to stagnate and die. The church must be willing to grow, adapt and try new things to stay healthy and effective. However, the book puts too much emphasis on style, technique and marketing know-how. The authors point to the many "successes" of other churches as a defense of the importance of being missional.
My concern is that while these successful churches have found a niche in their community and experienced growth, some grow as s a result of marketing rather than conversion. When we reinvent the church in order to attract the world, there is a tendency to eliminate or compromise the gospel, because it is divisive, offensive and even foolish to the world. Breaking the Missional Code touches on this fact but continues to advocate style and technique over the importance and power of the gospel itself. There is a great temptation for niche churches to offer another, more palatable, gospel in order to avoid offense. The result can be that many people stay and even invite others for relationships and become members of a Christian club rather than becoming followers of Christ.
The second thing that tends to be eliminated in these churches is the teaching of the whole counsel of God. This is done in an attempt to be relevant and to avoid the controversial truths of Scripture. I find this to be the greatest weakness of this book. It focuses on what people want rather than what God demands. The one area of greatest need in any church is the clear and bold preaching of God's Word.
It does not take cleverness or slick marketing strategies to grow a church or to make the gospel more attractive to the world. It takes authenticity in the life of believers that they meet. See the advise given by the Apostle Paul to Titus for his ministry to plant a healthy church on the island of Crete. Mission is not some hidden code to be broken. It is the work of God in the life of His Church (believers) and found in the power of the gospel. The Word of God, not the latest marketing book, is our best source for reaching the lost and it is Christ Himself who will grow His Church.
I recommend this book as a resource to help leaders examine church traditions that may be a barrier to reaching others and as a tool to think about specific mission strategies. However, read it with a careful and discerning mind being careful not to compromise the non-negotiable God ordained standards for an effective and healthy church.