Do the various branches of Christianity all claim to be representing the true content of the original foundation and original founder?

Someone I know made the following claim to me: > "The various branches of Christianity all claim to be representing the true content of the original foundation and original founder." (As opposed to saying that some of them claim [for example] to be rejecting the original foundations and replacing it with something superior). In order to make this a more focused question, I am only looking for the answer regarding; Catholicism, Protestantism, Anglicanism and Baptist. Is this true or not? Please source your answer.