The syntactic usage of some words in the Qur'an is not in line with the common rules of Arabic grammar, and this has been a pretext for opponents of the Qur'an since its revelation to attribute literary errors in the structure of the book known as literary miracles, eloquence and rhetoric to drive it out of revelation and diminish the tendency of human beings to Islam. Among them is a book called "Critique of the Qur'an" which has been published recently and in a part of it, the suspicions regarding the Qur'anic errors in the cover of modern literature are presented. The present study, while categorizing and selecting the most prominent syntactic doubts of the mentioned book about the nominative cases (marfou’at), including: "incompatibility of verb with subject", "the noun of “lakinna” being nominative", "the noun of “inna” being nominative" and "the masculinity of predicate of a feminine nouns", and the accusative cases (mansubat), including: "Subject in nominative construct", "Unreasonably function of an exception", "Exclusion of majority from minority" and "Plurality of the noun followed a number", tries to examine them descriptively-analytically and explain the most important related criticisms based on sound reasons. According to the results of the research, attitudinal vulnerabilities (biases and therefore attempting to falsely represent the Qur'an) and methodological vulnerabilities (lack of mastery of Arabic literature, lack of attention to the Qur'an as a source of Arabic rules, mere attention to the surface of the Qur'an and non-observance of research criteria) have made the authors of the book "Critique of the Qur'an" to slip in order to use their misconceptions as a basis for denying that the Qur'an is divine and claiming that it was fabricated by the Prophet (PBUH).