Creationists tend not to believe in vestigial organs which assumes an evolutionary explanation. Nor are there any useless functions in a creatures design. For example in the example you gave of a whale there is a reproductive purpose to the organ believed to be a leftover leg
Vestigial Structures - Answers in Genesis
Vestigial does not mean useless. That would be the first mistake. Vestigial means having a rudimentary or secondary function compared to the same organ in another species. To use a non-biological example, if my computer keyboard stops working I can still use it to pound in nails. If my old CRT TV stops working I can shoot some holes in it and use it as a boat anchor. That is essentially what vestigial organs are, pounding in nails with a broken computer keyboard.
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