Methodolatry
In going to different churches, many find disdain for different ministry, music and preaching styles. But if you look around and people are praising the Jesus of the bible and love the Lord, we should rejoice. However, if another gospel is being preached or a compromise of the principles of the Bible, we are obligated to speak clearly the way Paul does to the Galatians.
The right hand of fellowship is a sign of agreement, and in this case, with regards to the Gospel. This is the beautiful thing that promotes real unity. Unity has nothing to do with how often we have services together, get together or even serve together (even though those things are all fine and well). Rather, it has do with the diversity of all those sharing in the work of the Gospel. Methods must change and differ depending on context and calling. Biblical principles are universal and binding. Unfortunately, more often than not we reverse this and, as a result, create division.