There was only one global church in the time of Paul, which was started by my Jesus. No matter what locality the churches were in--Galatia, Ephesus, Corinth, etc.--they belonged to the one Acts church. They had one doctrine, faith, church, and sets of leaders, which were apostles, prophets, teachers, pastors and teachers, along with the deacons and elders.
At the time, Paul already saw impostors pretending to be disciples but were after dividing the church so they could set up their own churches different from the Acts church and get members from it. They taught things contrary to what Jesus and the apostles taught. Paul did not identify who they were but gave us some hints.
- They caused divisions.
- Put obstacles in the way.
- They taught things contrary to the teaching.
That deception continued to this day. I'm not saying denominations today had already existed then, but the wrong principles managed to continue to our day. They caused divisions. Denominations do that today. Instead of having one Jesus church as our Lord had prayed for in John 17, they maintain separate church denominations with different doctrines. And they fight anything that would completely unite all Christian churches today into one church--they put obstacles in the way. They don't want to give up their disunity.
And maintaining church denominations with separate and different doctrines is teaching things contrary to the teachings the Acts disciples had learned. Paul told the Romans to keep away from them.
But funny, it's different today. If you espouse the complete unity of the church as Jesus prayed for in John 17, and if you say church denominations should be dismantled to give way to the one church of Jesus worldwide, they'd see you as causing divisions, putting obstacles, and teaching contrary to their sound doctrine. And what they mean is, you're causing division in their denominations and breaking the status quo. You're a heretic and their members should keep away from you.
You should be able to see clearly in these last days who are anti-Jesus church and who are pro Jesus' church. Those who are gradually seeing the light in a completely united church as Jesus prayed for in John 17 start to have their denominations unmasked before them and also start looking for the one church which Jesus talked about and which takes after the Acts church, leading to the glorious church of Jesus Christ, without spot or wrinkle or any blemish, but holy and pure. This church alone builds the Kingdom of Jesus Christ on earth.