Answer:
Religious faith is in decline.
Step-by-step explanation:
"Dover Beach" is a lyric poem by the English poet Matthew Arnold. This was first published in 867, and it describes the shore of the English ferry port of Dover, in Kent. In these lines, the author reflects on the way the ocean moves in and out, and how the ocean's retreat is similar to the retreat of faith among people. The author laments how the "sea of faith" is retreating, which implies that religious faith is in decline.