Yes. Let the ideas speak for themselves. If you believe in the first amendment, the truth will win out in the end. In the case of this poor school, their final decision is to "trash" any further New Testaments that they receive, so no student will have the opportunity to judge for themselves whether the Jesus of the New Testament is the Messiah prophesied in the Old. Likewise, with the Communist Manifesto, better to read it young and debate and discard its' tenets as false than to encounter it later in a less discerning environment.