"Is a human an animal?"
Translation:Czy człowiek jest zwierzęciem?
it is not grammatically incorrect. in this sentence you can have all 6 permutations of człowiek, jest, zwierzęciem, with or without czy at the beginning and all would be technically correct.
Out of those 12 the sentence you wrote is the most weird sounding one. In the sentence where subject and object are nouns the best way is always subject verb object. And questions are formed like positive sentences, just with added question word.