I do not know why so much of mainline Protestantism has become a joyless religion. Perhaps we are more impressed by the problems of the world than by the power of God. Perhaps we have become so secular that we indeed think that now everything depends on us; that surely ought to make us depressed. Perhaps we have simply gotten bored with a boring God whom we substituted for the God of the Bible.
We sometimes sing the Doxology as if it were a dirge. Even the Eucharist, despite the words of the Great Thanksgiving, is rarely the thankful, joyous foretaste of the Great Banquet with the One who triumphed over Death, but mostly a mournful occasion for introspection. A joyless Christianity is as clear a sign that something is amiss as a dirty church.