It might mean giving up Sunday school, or a youth group, or Presbyterian Women, or a small group ministry, or sponsoring mission trips to Central America. Changes of this magnitude cause pastors and church leaders to tune out. It believes worship is enough. Haberlin is right in saying that worship attendance defines the church. Let it be that.
Worship is enough for children, youth and adults, and is a basic part of the covenant they make.
Their primary place in the church is worship and not church school or small groups. It poses a new question. It makes the new member class important. The purpose of the new member class is to provide opportunity for all participants to understand themselves in a new way as ministers of the church. It is a rite of passage.