What are the essential components of a Protestant evangelical church? What are the essential attributes of a church, according to the Bible as interpreted by Protestant evangelical traditions? I've started a list but feel that it is incomplete:


Ministries
Missions
Leadership
Fellowship/Bible study Groups
Prayer Meeting
Holy Communion
Worship
Robert Warren has written the Healthy Churches Handbook, which provides a checklist for identifying the health of a church. The Seven Marks of a Healthy Church are listed in Appendix 4 and have been summarised by the Diocese of London:


  
  Energized by faith
  
  rather than just keeping things going or trying to survive
  
  &bull; worship and sacramental life: moves people to experience God’s love
  &bull; motivation: energy comes from a desire to serve God and one another
  &bull; engaging with Scripture: in creative ways connect with life
  &bull; nurtures faith in Christ: helping people to grow in, and share their faith.
  Outward-looking focus
  
  with a 'whole life' rather than a 'church life' concern
  
  &bull; deeply rooted in the local community, working in partnership with other denominations, faiths, secular groups and networks
  &bull; passionate and prophetic about justice and peace, locally and globally
  &bull; makes connections between faith and daily living
  &bull; responds to human need by loving service
  Seeks to find out what God wants
  
  discerning the Spirit’s leaning rather than trying to please everyone
  
  &bull; vocation: seeks to explore what God wants it to be and do
  &bull; vision: develops and communicates a shared sense of where it is going
  &bull; mission priorities: consciously sets both immediate and long-term goals
  &bull; able to call for, and make, sacrifices, personal and corporate, in bringing about the above and living out the faith.
  Faces the cost of change and growth
  
  rather than resisting change and avoiding failure
  
  &bull; while embracing the past, it dares to take on new ways of doing things
  &bull; takes risks: and admits when things are not working, and learns from experience
  &bull; crises: responds creatively to challenges that face the church and community
  &bull; positive experiences of change: however small, are affirmed and built on.
  Operates as a community
  
  rather than functioning as a club or religious organisation
  
  &bull; relationships: are nurtured, often in small groups, so people feel accepted and are helped to grow in faith and service
  &bull; leadership: lay and ordained work as a team to develop locally appropriate expressions of all seven marks of a healthy church
  &bull; lay ministry: the different gifts, experiences and faith journeys of all are valued and given expression in and beyond the life of the church.  
  Makes room for all
  
  being inclusive rather than exclusive.
  
  &bull; welcome: works to include newcomers into the life of the church
  &bull; children and young people: are helped to belong, contribute and be nurtured in their faith
  &bull; enquirers are encouraged to explore and experience faith in Christ
  &bull; diversities: different social and ethnic backgrounds, mental and physical abilities, and ages, are seen as a strength.
  Does a few things and do them well
  
  focused rather than frenetic
  
  &bull; does the basics well: especially public worship, pastoral care, stewardship and administration
  &bull; occasional offices: make sense of life and communicate faith
  &bull; being good news as a church in its attitudes and ways of working
  &bull; enjoys what it does and is relaxed about what is not being done
  


There is almost certainly a significant overlap between these "marks" and the list you have formulated, but his number 4 and number 7 might be slightly surprising. Your list identifies some of some of Warren's bullet-point evidences of the major underlying characteristics.