From Brendan Byrne in The Hospitality of God: A Reading of Luke’s Gospel (2000):

We retain the doctrine of the “Second Coming” in our affirmations of faith, not because we literally believe–as fundamentalists do–that Jesus will one day appear as Son of Man on the clouds of heaven, but because we believe that the biblical assertions to that effect affirm the eventual triumph of God’s sovereignty in the universe and that all is provisional till that occurs.