The term ekklesia, from which we have church, is a generic term, and applies to any assembly, good or bad, temporal or permanent. In Acts 19 it is used with reference to two different assemblies, and neither religious.
Polity means form of government.
That the New Testament was given for that purpose and is all sufficient, is only denied by ignorance or bigotry. But that she could everywhere enjoy all the benefits and perform all the duties of the church organic, a full corps of officers was authorized in every city, town and community that formed a central point for worship. All in reach of any such point, who were recognized as disciples, constituted the Church of God in that locality. Nothing is said of the induction or admittance into those local churches. By their fruits they were recognized as disciples, and consequently integral parts of the Church of God in that locality.