Fundamentalist Christians often believe some loony things, but so do fundamentalist Muslims. The Salafi Center of Manchester, for example, says that mermaids are real and they are halal, so they can be eaten if you catch one. Yes, I’m serious.
Questioner, “Shaikh, some experts and specialists in sea-life and fish mention that there is a fish that has a head like the head of a woman, and she has hair and a face like a woman, so is it permissible to eat it…and that is what they term as the “mermaid”?
Shaikh al-Fawzaan, “There is the “human of the ocean”, there is something from a type of fish upon the appearance of humans, they call it the “ocean human” [otherwise termed as "mermaid"] and it can be eaten, it is from the items that can be caught and eaten from the sea, yes, even if it was upon the appearance of a man or woman”.
Okey dokey, then.