Yes, we really cannot fault Mr. Del Rio for doing his homework on comparative religions. He spends an entire chapter exploring Salt Lake City and its Mormon traditions, and even seems to carry away some of their literature. We cannot fault Del Rio for manifesting a spiritual thirst and spiritual hunger, even though he fails to explain the Christian view of Mormonism as a pointless road to nowhere, but whatever. At least he did his research, even if the grain of salt is not very easy to find there.
And then in his third voyage he is seen meeting with the pope, albeit for his wife's sake, but his own faith was not clear at times in his rambling narratives, so obviously this cannot be categorized as a religious type of book. It was a travel book.