Your belief is not required. Scientists pigeon hole most things - makes things more orderly. By definition, Man is an ape. You don't have to like it, but if will use the word then it has a specific definition. You can't have your words defined as you want without running the risk of being misunderstood or of being incapable of communication. That's why we have dictionaries.
If you want to consider yourself an ape, that is fine with me. I however am human.
Just don't try to define "theory" out of the dictionary. You'll get flamed for that. Scientists, I have been repeatedly told, have their own special version of the definition. (so as to accuse creationists of semantics.)