Frustrations with the church

Among many frustrations that one could mention about churches, the one that gets me the most is that nearly all churches/denominations function as if they are the only church that God is using or cares about. I know most churches wouldn't say they feel that way, but I noticed it again today. A church I work with is making plans as if there are no other churches in their community and I have to say, that is frustrating. Of course, I have not walked in those people's shoes, and I believe that God does bless some churches and not others in ways that that I don't understand. I'm just weary of the idea that what our church is doing is all that matters. There is a great big body of Christ out there and we should all care about what is good for the entire body, not just our little chunk of it. I apologize for the rant, but I believe God has great blessings in store for churches who want to be a blessing to the other churches around them.