Summaries of the Christian Faith in creeds and confessions also provide an object standard by which the Church is to discipline those in error, whether doctrinal or ethical. This is eminently practical in our day in which too many churches have sprung up from a person's desire to be a pastor and in which people flock to a church based on feelings, preferences, and "successful" ministries. What happens in these types of churches is that the pastor is a pope and there is no accountability structure except "what the pastor says, goes." Thus people are excommunicated, disfellowshipped, and shunned without any biblical steps of reconciliation, simply because of personal differences or not agreeing with the Pastor.
In a Reformed church this is not so. For example, if a member should stray from the truth, other members and the elders have a way of objectively identifying their error. Since everyone says, "I believe the Bible," the creeds and confessions give a summary of the Word as well as an explanation on difficult points of doctrine. For the welfare of the wayward believer as well as the entire congregation, the elders are given the ability to hold an erring believer accountable. The same holds true for ethical error within the church. Church discipline, then is not a case of the pastor versus someone teaching contrary to his doctrine, of a person who sins being immediately kicked out, but it is a loving process, clearly delineating between truth and error (Rom. 16:17).
From Daniel Hyde's article, "...And taught in this Christian Church" Christian Renewal (May 31, 2006): 26.