To say "I believe in the communion of saints" surely means different things to different people and also has manifold meaning. For me and for the church at large through the centuries, this is a confession of utmost importance.
Impacted by American Christianity we're used to brushing such a confession of faith aside, at least many of us. And we find local churches who call themselves "independent". An independent local church is an oxymoron; there is no such thing. God has made us interdependent and Christ in this world today is manifest through his Body on earth. This Body is localized in various places and settings. But it's a Body in communion with other gatherings scattered throughout the earth. And I believe it's a Body in communion with all of God's holy people ("saints") from every time and place.
We don't need churches looking down on each other and thinking they are better than so and so church. But sadly, neither do we need churches that seem to have lost much of what church is all about. It is God's people living interactively in this world under one Head, Christ, doing so interdependent on each other.
The Lord is grieved when there is disunity among his people. This is true within our gatherings and it's also true all the way to the Church scattered throughout the earth. But everyone has to keep working on just what "church" is, that it's not merely religion, or some intellectual assent to a creed or some super gathering around some charismatic leader who is wowing everyone with their speaking, maybe along with some miracles. We don't need any of the above. What we need is a humble Body, interactively working together in communion with Jesus and each other. Anything less than that is not Christianity or is some diluted (and perhaps dangerous) form of it.
What might you add to these sad and difficult thoughts I've shared today?