The Greek word for church is ''ekklesia'' which means 'called out'. The church is made up of those who are called out of the world, not those who are called into a building. This means that there may be people in the building who are not really the church. We don't fret it. Where would you rather have them be, than learning the word of God. There is one mechanism are two mechanisms to remove people from the local church and it . One is to be used only for the one who is teaching others to sin either by their words or by their unrepentant grievous and public sin.The other is used by the Spirit to drive away those who were not of us <ref>1Jo 2:19 They went out from us, but they were not of us; for if they had been of us, they would [no doubt] have continued with us: but [they went out], that they might be made manifest that they were not all of us.</ref>