There Is Only One Church

1 Corinthians 12:12-14 KJV
(12)  For as the body is one, and hath many members, and all the members of that one body, being many, are one body: so also is Christ.
(13)  For by one Spirit are we all baptized into one body, whether we be Jews or Gentiles, whether we be bond or free; and have been all made to drink into one Spirit.
(14)  For the body is not one member, but many.