In dover beach by matthew arnold, what does the speaker mean when he says that the “sea of faith” is retreating?

Need how does black hawk’s rhetoric in this excerpt advance his viewpoint that his cultural experience has fueled in him great animosity for white men? the white men despise the indians, and drive them from their homes. but the indians are not deceitful. the white men speak bad of the indian, and look at him spitefully. but the indian does not tell lies; indians do not steal. a-he creates an extended metaphor to suggest he has a thorough understanding of white men. b-he uses alliteration to emphasize the morals and values of the indians. c-he employs personification to capture the confusion he feels when dealing with white men. d-he contrasts the image of white men driving indians from their homes with examples of the admirable conduct of indians.