That well-known and startling statement is a complete "chapter" in William Faulkner's As I Lay Dying. It may only be a choice bit of Faulkner's gothic rhetoric, but it can be used to make a useful point, I think. If a child, like Vardaman, made such a perverted statement and one set out to correct it in Christian Science, he certainly wouldn't pray for a correct concept of a fish. To establish in Vardaman's thought the proper sense of a human mother wouldn't permanently or Scientifically correct anything either.
The root of the animal magnetism, aggressive mental suggestion, claim, or temptation harrying one may lie much deeper than the tears and pain occasioned. "That which is least distinct to thought is most forcible." (My 197: 2-4) How many of us have a cherished or feared glass menagerie we keep enshrined on a shelf deep within the shadows of our false beliefs? For many (most?) of us only strict obedience to God and His laws and the absolute purity of thought the furnace of affliction brings will allow Science to get to all of it and destroy it. Mrs. Eddy tells us, though, that the warfare with oneself is grand and gives idle minds, and even busy ones, plenty to do. We certainly don't think our loving Father-Mother God is a fish--at least I hope not--but are there not too many times when our disobedient and apathetic "three-day" thoughts of Him begin to smell? As we break the bonds of mortal mind and its enslaving beliefs we might do well to sing in our dissolving chains "like the sea", though time should never be permitted to hold us "green and dying" as we do so. (See "Fern Hill" by Dylan Thomas)
Note: I'm sorry if I appeared to take the commenter on brevity "to task". My comment was merely an explanatory comment thereon.