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If you cannot criticize Islam unless you know Classical Arabic (because your understanding of what Islam is may be erroneous), then it logically follows that you cannot propagate Islam unless you know Classical Arabic (because your understanding of what Islam is may be erroneous). No Muslim would agree to that because most Muslims do not understand Modern Arabic, let alone Classical Arabic.
fundamentally impossible for anyone to learn a language that cannot be translated into the only one they do know, which means those who insist that one "must learn Arabic” in order to understand the Qur’an are committing a [[Logical Fallacies|logical fallacy]]. Either the Arabic of the Qur'an is translatable (in which case there is no need to learn Arabic) or it is not (in which case it can never be learned by the non-native speaker).
The Arabic language is no different to other languages; if other languages can be translated accurately, then so can Arabic. Critics or adherents of Judaism, Christianity and Hinduism do not need to speak Hebrew, Greek or Sanskrit in order to understand these faiths, and the same applies to Islam.