Only one

1 Cor 1:9
God is faithful, by whom ye were called unto the fellowship of his Son Jesus Christ our Lord.

For one brief moment, with the formation of the True church upon earth after the salvation of Saul, the early church recognized and knew no other fellowship than this, and walked in the unity of the Spirit in its  manifestation. This was the gathering center for the believers of that day.  

There is only one true church.  while there are many divisions of the religious peoples, there is only one church.