What is signified by the reference to the Bible in the end of "Down at the Cross"?

The reference to the Bible at the end of this section has several layers of meaning. In terms of both the book's general perspective on, and the author's personal relationship with, Christianity, the quotation is perhaps a reminder that Christianity's presence and influence is inescapable. In terms of the meaning of the verse itself, it refers to the Biblical story of Noah and the Flood.