P1. The Qur'an (Surah 9:30) states that "the Jews say Ezra is the son of God."
P2. There is no historical record of mainstream Judaism (or any identifiable sect) ever worshiping Ezra as the son of God.
P3. If the Qur'an is the eternal, clear word of God for all people, it cannot misrepresent the beliefs of an entire religious group.
P4. If the Qur'an refers only to a minor or heretical sect, then its language ("the Jews") is misleading, unclear, and unjustly condemns all Jews.
P5. A divine revelation that is either factually false or misleading/unclear cannot be the perfect, eternal word of God.
C. Therefore, either (a) the Qur'an is factually wrong, or (b) the Qur'an is unclear and self-contradictory. In either case, the Qur'an fails its claim of being the perfect, clear, eternal word of God.