The Idea of Church is in Trouble.

Looking at the NT we see where people were immersed on Pentecost. Being immersed was their response to instructions Peter and the apostles gave to them based on their question concerning what should they do which was their reaction to being told they had killed Messiah. Luke tells us that God added to their number those being saved. We see where their number continued to increase.
 
I do not believe the Bible tells us that these people understood they had just bought in to teaching the world. Thus I do not believe they had any responsiblity beyond their sphere of existence. There is no indication of anyone going about telling the world about Jesus. When persecution began they left the city and when asked told the people why they were running for their lives.
 
It would be natural for people with like beliefs and like fears to congregate together to strengthen and encourage each other. There is nothing in the Bible they congregated to worship. That is man's idea to save their job.
 
Since that time because of King James we have to deal with his idea of those assemblies via the word church. If he had permitted that word to be changed to a meaningful word he would have lost his position as head of the church of England. Without the word church what would he have been the head of? Poof, he would have had to stick with his day job as king.
 
After James we had the preachers to contend with. To keep their day jobs they had to organize church. Today we go to church, we do church, unbelievers are the unchurched. Anyone can start a church. So the term has lost is relevance. Today, the saved are a group, one group that includes the saved of all time. We have tolerated the word church and now we have to live with it and with people's attitudes about the church as a meaningless entity. The saved will always gather to encourage each other. Those not gathered are by definition not saved. They are rejecting the group to which God added them upon their immersion. There is nothng more for them. They are lost. As others in the Bible they have gone out from us. They were never a part of us.