Allan said:
...Such as the church (singular) in Jerusalem. There was no one church (that I can find historically or biblically) but most probably many individual churches that were one in unity thus one whole church body of many. This church (singular) in Jerusalem is always addressed but I haven't seen any proof that over 3000 people met in one place everyday eating, studying, praying, fellowshipping, and praising God. So here we have an instance of many churches being called one church body. Thus if there were one pastor in a church you would not know about it because all the elders of all those churches were addressed as one body- therefore a plurality is the proper discription.
Brother Allan, let's consider the description of the church in Jerusalem as described in Acts 2.
Acts 2:41-47 Then they that gladly received his word were baptized: and the same day there were added unto them about three thousand souls. And they continued stedfastly in the apostles' doctrine and fellowship, and in breaking of bread, and in prayers. And fear came upon every soul: and many wonders and signs were done by the apostles. And all that believed were together, and had all things common; And sold their possessions and goods, and parted them to all men, as every man had need. And they, continuing daily with one accord in the temple, and breaking bread from house to house, did eat their meat with gladness and singleness of heart, Praising God, and having favour with all the people. And the Lord added to the church daily such as should be saved.
When we start at verse 41 and follow this through to the end of the chapter, I don't understand how we can come up with churches plural? 3000 were added to the 120. They all continued steadfastly in the apostles' doctrine, etc. They all had all things common, etc. This is not to say that every time they met all the 3000 were always present. But it is to note that the entire group as a group is called the church, and there is no specific mention or implication of churches plural. Part of the members of one church at Jerusalem could have met at different times in different homes without us having to consider them churches plural. I don't see how we can get from the text to where we have "many churches being called one church body". It seems to be one church being called one church body.