To claim that the Bible doesn’t tell us what church should look like is to ignore many, many very clear scriptures. To claim that the Bible doesn’t tell us what church should look like also allows a person to substitute his own preferences for the clear teaching of scripture, which Don Miller seems to do at numerous points in his blog post.
The church is also to equip believers in Christ with the tools they need to overcome sin and remain free from the pollution of the world. This is done by biblical teaching and Christian fellowship. So, what is the purpose of the church? Paul gave an excellent illustration to the believers in Corinth. Church order provides a way for us to live and work together as the body of Christ, following the admonition that "; all things be done decently and in order"; (1 Corinthians 14:40). Order is a way to express our unity and achieve cooperation and harmony in the body of Christ as we seek to fulfill our mission.