Why does God need a church?

Since our Doing What Matters mission area assembly on Saturday, I've been thinking deeply about this question. Job's friends end up being his church. The verse from today that speaks to me is this:
"If you set your heart on God and reach out to him, you'll keep a firm grip on life, guiltless and fearless."

Biblically, there are 5 reasons churches exist:
In the Great Commandment, Jesus says, "'Love the Lord your God with all your passion and prayer and intelligence. This is the most important, the first on any list. But there is a second to set alongside it: Love others as well as you love yourself." This highlights the importance of worship and serving others. We tie them together every Sunday, "Go in peace to love and serve the Lord." Thanks be to God.

In the Great Commission, the Christ says, "Go out and train everyone you meet, far and near, in this way of life, marking them by baptism in the threefold name: Father, Son, and Holy Spirit. Then instruct them in the practice of all I have commanded you (see above). I'll be with you as you do this, day after day after day, right up to the end of the age." In these words, we realize the necessity of learning, fellowship, and evangelism.

Our mission director, Jane, made it clear that just as you can't say yes to everything, we as a church need to have priorities. While we ought to be doing all of these things, we won't be able to do them all well. If you had to put these five activities in order of importance, how would you do it (I have listed them alphabetically, so as to not influence you)?
Evangelism
Fellowship
Learning
Serving others
Worship

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