Your opinion is in error as is your understanding of the church which is not a monolithic institution,
Of course the NT church was monolithic--as to a single denomination.
And those individual churches, which constituted the single denomination--were established by the apostles and elders of the NT:
Acts 16:4---King James Version
4 And as they went through the cities, they delivered them the decrees for to keep, that were ordained of the apostles and elders which were at Jerusalem.
So--which denomination has those qualities today?