The Local Church ...
In my model of a Protestant-based, One Apostolic Church, there is no single world-wide church of Christ, no global Christian institution to which all Christians belong. Church governance is varied and fragmented. In short, church governance is local, not global.
Throughout the church age people have tried to establish large, even global church government. Christendom was such an attempt. Each of the Protestant reformers probably had hopes that their denomination would take over the world.
Denominations attempt to provide unity for the various member churches, some with more success than others. But eventually all denominations fragment as people with slightly different views break off and start their own denomination.
There are many styles of church government. Some claim their form of church government is based on the New Testament model, others don't care if it is or not.
Kinds of church government ...