Just consider Eliot's 'The Hippopotamus' and think whom exactly does it represent,
the True Church or the False.
Meanwhile some fun:
B. C. Southam suggests that Eliot saw a private joke here. He started as a banker's clerk
at Lloyd's in March 1917, "an event he signified here through an allusion to one of the Songs
in Sylvie and Bruno (1889), the novel by Lewis Carroll: `He thought he saw a Banker's Clerk
 / Descending from the bus: / He looked again, and found it was / A Hippopotamus: "If this
should stay to dine," he said, / "There won't be much for us!"'" (A Guide to The Selected
Poems of T. S. Eliot, 6th edn. [San Diego: Harcourt Brace, 1994]: 106).