How does Ralph Ellison use imagery in Invisible Man?

In Chapter Five, the imagery in the opening is dark with words like bloody, crucifixion, doom like, and torturous. The narrator describes the students entering the chapel with love in the sense of the way the defeated come to love their conquerors. He also describes the preaching here as being logical and different from the wild emotion from the preachers most of the students know at home. The narrator describes the millionaires as the flesh and the blood who carry out the virtues.