How does the doubt expressed in these lines from "Dover Beach" reflect the historical period in which the poem was written?

The poem was written during Victorian times. As we all know it was in those years when one of the so called industrial revolutions took place. The developments of the era might have made humans less sentimental and more interested in the benefits brought by money and advances ... "the Sea of Faith" described by the author seems to be fading away. The coming of a time in which individualism is more important than everything has arrived into the lives of those who live in "Dover Beach". The author gives the impression of being disturbed by the wind which is now present on the coast instead of the calmness that used to reign on the place.

The answer is: people in victorian times no longer felt that religious faith was a certain comfort