So Christ established His Church with teaching authority, and handed it over to every 3 or 4 folks who got together?? Is that what you are saying?
And what if your church disagreed with the church across town?
That's between them and God as long as they don't try to teach their error to the public. Then I would have to counter with scripture just like we do with the error of the Catholic religion here. If they persist in their error they surely wouldn't be allowed to meet with us.
What of it? Not everyone is as much a control freak as the Catholic church.
It would fall under what Paul called disputable matters (Romans 14) if it was not an area that was important for salvation.
And if it was, they answer to God for it but they don't take down hundreds, thousands, or millions of people with their false teaching.
The damage is contained in smaller numbers. Not as many people are going to be affected by it.