How does Nelson DeMille use imagery in Cathedral?

Examples of Imagery:

"Langley lit a cigarette and noticed his hands were unsteady. Kline and Doyle, he was convinced, were doing the right things in attacking the Cathedral. But with the sure instincts of the politician, they were doing it for the wrong reasons, in the wrong way, and going about it in a slimy manner. But so what? That was how half the right things got done."

"Inside the Cathedral, Flynn kneeled at the communion rail. The raised marble area, the altar sanctuary, was decked with fields of green carnations, and he studied the festive decorations. It had been four years since he had left Whitehorn Abbey; four years since he had seen her. Today he would see her again, for the last time."