A trio of gems from W.H. Auden’s essay on “Christianity and Art”, which can be found in the collection The Dyer’s Hand:

To a Christian, the godlike man is not the hero who does extraordinary deeds, but the holy man, the saint, who does good deeds. But the gospel defines a good deed as one done in secret, hidden, so far as it is possible, even from the doer, and forbids private prayer and fasting in public. This means that art, which by its nature can only deal with what can and should be manifested, cannot portray a saint. – pg 457

There can no more be a “Christian” art than there can be a Christian science or a Christian diet. There can only be a Christian spirit in which an artist, a scientist, works or does not work. A painting of the Crucifixion is not necessarily more Christian in spirit than a still life, and may very well be less. – pg 458

We cannot have any liberty without license to abuse it. The secularization of art enables the really gifted artist to develop his talents to the full; it also permits those with little or no talent to produce vast quantities of phony or vulgar trash. When one looks into the window of a store which sells devotional art objects, one can’t help wishing the iconoclasts had won. -pg 460