No way you can prove they were all Christians there that day or any other.
Bob this wasn't a sermon Paul was delivering. It was a letter and he tells us EXACTLY who the letter was addressed to. It was addressed to beleivers. He was speaking ONLY to believers! That is just the simple facts of the matter.
An unsaved person can't understand about walking in the Spirit and walking in the flesh anyway. That's a spiritual message and unsaved people are spiritually dead.
The ONLY message a spiritually dead person can understand is that Christ died according to the Scriptures as their substitute becuase of their sin. That's it! If they believe that Jesus died in their place and shed their blood to clense their sin then they are saved. Period. End of the Biblical discussion on spiritual salvation. It really is the SIMPLE Gospel message of salvation, not this complicated believe and then prove it with works, but who knows if its enough or the right kind.
Why pervert the simple message of believe and you will be saved (Acts 16:30-31)?
Tell me J. Jump; Why do you resent me so much?
Brother Bob I don't resent you at all. I don't like it that you make things up about me that aren't true. But there are several others on this board that do the same thing, with no apology. But I don't resent you for it. I just wish you wouldn't do it.
And I do feel bad for the people that are under your teaching, because I think you are leading them astray in some areas. That breaks my heart. But I don't resent you for it. I'm not sure why you would think I resent you?
Also, I am sure that you are smart enough to know that among every gathering they had and we have there are unsaved among us. You do acknowledge that don't you?
See this is actually why I like you Brother Bob. You call me stupid in one thread and then turn around and tell me how smart I am in the next

Just a page back or so I was so stupid I couldn't read, but now I'm smart enough to know that there are unsaved folks in the church.
Yes Brother Bob I am very well aware there are unsaved folks in the church. I don't however think that when the church is being spoken of in Scripture it is speaking of the saved and unsaved that meet in a building. I think it is fairly clear that when the church is spoken of in Scripture it is speaking to believers that make up "the" church.