As I noted in the review, I would have some reservations with some of the methodologies DeYmaz describes. He also goes looking a bit too hard for a biblical rationale for pursuing ethnic diversity in a local church—harder than is necessary to make his case, in my opinion.
Nevertheless, it's worth reading if for no other reason than the fact that so many conservative evangelical-fundamentalist churches are so lily-white and never think much at all about how to cross entrenched ethnic divides. It was relatively easy to sift through the ideas I disagreed with on biblical bounds, while still profiting substantially from the exercise of thinking outside my comfortable position of the ethnic majority. On top of that, DeYmaz was clear on the priority of the gospel and the fact that pursuing ethnic diversity or harmony is not in any way the sum of the gospel message.
So here's my conclusion:
If you're pastoring or church planting in a context in which your church is less ethnically diverse than your community, or if you hope that God will raise within your congregation people who will pursue ministry in a multi-ethnic setting, DeYmaz' book is a worthwhile read. But absorb its biblical-theological argumentation with a discerning eye. That is, read DeYmaz' Scripture citations in their biblical context to confirm that the emphasis of the text is consistent with his argument. Consider the ecclesiological implications of prioritizing multi-ethnicity. The church is a body. It shouldn't be surprising if increased attention to one aspect of the body's life has effects, whether positive or negative, on the rest of the body
Also, read its methodology as description, not prescription. In other words, DeYmaz offers us one account of what worked well in one church in one context. But what worked in that context may not apply equally well in differing situations.
DeYmaz seems to recognize this, and he speaks of general principles as well as specific strategies. These general principles constitute a broad framework for the kinds of questions churches will need to consider as they pursue healthy multi-ethnicity. Whether those churches reach all DeYmaz's conclusions is probably not that important.
But two priorities are essential for every church that hopes to grow towards healthy multi-ethnicity. First, these churches should draw on DeYmaz' practical insight. Don't discard his advice lightly without a clear, biblical argument to the contrary.
Even more importantly, they should recognize that the power of the gospel is creating an eternal, universal, multi-ethnic community. No church that desires to reflect an accurate picture of how Christ's kingdom has broken into this age should be satisfied to display merely a monochromatic image.