Acts 2:42 says, "And they devoted themselves to the apostles' teaching and fellowship, to the breaking of bread and the prayers." Phil. 1:5 says that the Philippians had partnership (Gk. koinonia, translated "fellowship" in Acts 2:42) with Paul in the gospel. 1 Jn. 1:3 links the church's fellowship in the gospel with the believer's fellowship in the Trinity.
That doesn't mean that we have coffee and donuts with the Trinity, does it?
"Fellowship" is one of those biblical words that we've castrated. What the Bible connects to the Trinity, prayer, biblical teaching, and the sufferings of Christ, we use to describe what happens when believers get together to watch The Princess Bride.
This is one of the clearest symptoms of church-as-social-club that I know. Only Christians use the term (I've never heard believers talk about getting together for some fellowship over pot, liquor, and casual sex...), yet with little resemblance to its uniquely Christian meaning.
And "fellowship" is far from the only Christian term we do this with. Is it really outreach, or is it just believers drinking tea together? Is it really worship, or is it just believers having a sing-a-long? Is it really preaching, or is it a guy firing off semi-Christianized moralisms?
So fellowship is the word that got this little diatribe going (thanks to some insightful comments on Phil. 1:5 from the youth group summer camp speaker this week). And it is worth noting that I experienced what seems to be the real intent of that term when a bunch of us youth pastors who didn't know each other got together and prayed fervently for God to work in the lives of our students. That was fellowship.
But that isn't even really the big issue. The big issue is that a whole lot of what we call "ministry" isn't ministry at all. It is just believers who go to the same church doing stuff together. And that doesn't qualify as ministry.
What we've got to do is what a lot of quasi-Emerg*** types have been saying for awhile now: stop wasting our precious time ("the days are evil" after all) on stuff that doesn't meaningfully contribute to the church's mission.
Oh right, there's another: by mission, I don't mean spending thousands of dollars to fly across the world to somewhere more exotic and paint a church for two weeks. Just so we're clear.