yes if you actually say it but not if you dont
In the christian belief, it isn't the building that is the church; A church is the body of believers, who meet within the building.
No, Orthodox churches are where persons of Greek or Russian Orthodox faith worship. Like the Church of England, the Orthodox also separated from the Roman Catholic Church on matters of doctrine.
The plural noun for church is churches.
Church of God in Christ (COGIC) Church is not an Apostolic Church.