Body of believers
        The Church, individual and collective
        Churches in the New Testament
          were house-sized. This can be proved by the various references to believers
          meeting "in the house of" (Romans 16:5; 1 Corinthians 16:19;
          Colossians 4:15; Philemon 2).
        However, a church could also
          refer to a number of churches within a city. An example of a city-wide
          church is found in Paul's letter to the Corinthians. At the beginning
          of first Corinthians, Paul mentions that there were divisions among
          them. Some would claim allegiance to Peter, others to Paul,
          and still others to Apollos. Very likely those who claimed allegiance
          to Peter assembled in one place, the Paul assembly in another and an
          Apollos one somewhere else. So Paul deals with this problem as a collective
          problem, as if it were affecting just one church.
        Also, when problems arouse
          in individual churches, it tended to involve the wider church, or city-wide
          church. For example, the Jerusalem church had to sort out the problem
          of the widows who were being neglected in the distribution of funds
          to them (Acts 6), and the resolution of the problem on whether Gentiles
          should be circumcised when they became believers (Acts 15). So they
          convened with representatives from the many house churches that were
          operational in Jerusalem by then. (Jerusalem must have had numerous
          house churches after the 3,000 baptisms at Pentecost and the many that
          were added on a daily basis [Acts 2:47].)
        Now the question should be
          asked, "Was the model followed by the New Testament Church a mega-cell-church
          concept or did the individual house-churches truly have autonomy?"
          In other words, was the relationship among the many city-wide house
          churches a symbiotic relationship (needing the other to survive) or
          a commensalistic one (deriving benefit, but not needing the other for
          survival)?
        The role of leaders
        The answer lies in first
          understanding that church leadership in the New Testament is not seen
          to be positional or hierarchical, but merely advisory and functional.
          The governmental mechanism in the New Testament churches was that
          of collective and consensual decision making and not executive leadership
          mandate. The traditional and prevailing idea that church leadership,
          whether local elders or traveling apostolic ministries, had delegated
          authority over the churches would have been alien to New Testament believers.
          Far from being through an executive authority of leaders, church decisions
          were made by the gathered saints. They were church body decisions.
        Thus, elders (or apostles,
          or any other leaders, local or otherwise) were not in any way hierarchical
          or positional, but only functional. They were there to serve the church;
          they were not there to rule over the church. In other words, they
          are neither authorized nor responsible for making decisions on behalf
          of either their home assemblies or those they visit. Again, decision
          making in the apostolic era was both collective and consensual. Even
          to the ultimate and extreme responsibility of exercising church discipline,
          both the Lord Jesus and Paul laid the responsibility not at the feet
          of the elders, but on the collectively gathered church to which the
          decision pertained (Matthew 18 and 1 Corinthians 5).
        The very reason leaders do
          not have positional or hierarchical authority over people is precisely
          because, whether pertaining to individual churches or a wider church
          scenario, the only hierarchy we see in the pages of Scripture is Jesus
          and everyone else. Leadership, whether in the form of local elders or
          apostolic ministries traveling much more widely, is simply there to
          teach and equip churches, and to show them, amongst other things, how
          to actually engage in collective decision making and to facilitate them
          in the process. Leaders are themselves part of the process, of course,
          but they are not the process itself.
        The end goal is to strengthen
          families. Having families come together and collectively exercise ultimate
          authority strengthens and upholds them. Thus, the two keys to the
          success of a church in this regard are: understanding that a church
          is an extended family of believers, and that leadership is only functional,
          not positional and hierarchical.
        It is in this context that
          the appointment of deacons makes sense. The Jerusalem believers
          appointed seven chosen men to look out for the widows precisely in a
          situation that affected all the house churches. That is to say, it was
          a situation affecting more than one individual church, and so must be
          dealt with by the wider church and on a multiple church basis.
          
        Thus, elders were meant to
          be functional leaders for the local church (deacons need not
          apply); while deacons were functional leaders in practical matters for
          the city-wide church (elders need not apply). In the same vein,
          apostles functioned for the benefit of the Universal Church,
          seeding and planting new churches (as Paul eminently exemplified) and
          shepherding (teaching and caring for) the established ones.
        (The above is a condensing,
          reworking, and adding to the article, "The City-Wide Church Problem!"
          For the full text go here)