To be a member of a church is to make a public promise to live according to the Word and to support the work of the congregation. In the Bible this is called a covenant. Every believer is part of the church when we think about it as an organism (the Spiritual Body of Christ), but only by a public promise can someone be part of the church as an organization. A public promise, or covenant, is the basis for all society according to the Bible: marriage, employment, citizenship, church membership, etc., are all relationships of accountability.
Membership in a church is not like membership in a social club or other organizations. Most organization members are consumers; the organization exists to serve them. The Church of Christ is a completely different community - membership means ministry and service, going from being a consumer to becoming a provider of God's love and care to others. At Redeemer, we take seriously that we are a church not for ourselves, but for others.
To learn more about the membership process, click here