This is only a bit of what he writes. You should read the whole thing for yourself but I found this passage fascinating:
But in my experience, there is in Grand Rapids a strange combination of being tight on cultural categories while at the same time being loose on doctrinal categories. Whether its Christian schools, or things you don’t do on Sunday, or Republican politics, or being really nice, or being tall and Dutch, or being very put together there is a certain feel to Christianity in Grand Rapids. It’s hard to break out of these categories. And yet on the doctrinal side, there’s been an unwillingness to get worked up about theological issues. The yard should look a certain way, but the historicity of Adam is flexible.