The Greek for "Church", "Ecclesia", was not used in the New Testament, like the word "church" is used today.

Saints in the Church? God has many pet names for His people.  Each designate its own purpose He has for us.   Neither Saints nor Church were religious words in the original Greek. We don't understand either term, especially Church, because we don't see a Senate or City Council as a Church.  Acts 19:23-41 reveals what the term "Ecclesia" or "Church" means.  They were a non-Christian "church" who worshipped the goddess Diana, but had the responsibility to decide the morals and policy of a public situation in their culture.