The Bible teaches that there was one and only "one" church in the first century.
The Bible is of course our evidence for this affirmation.
The word church comes from the greek word ekklesia and simply means "the call out"
The church of the New Testament was composed of people who were called out
of darkness by the Gospel into the light of the Son of God.
(ll Thess. 2:13-14) (Col. 1:14)
Such a group of "called out" people in any given community was called "the church".