This doesn't take into account that the vast majority of Arabs are Muslim and learn the intricacies of Quran and Quranic Arabic as kids, so they will understand

This doesn't take into account that the vast majority of Arabs are Muslim and learn the intricacies of Quran and Quranic Arabic as kids, so they will understand it quite well. Speaking Arabic natively makes a huge difference in that the resources for understanding Quran are all available to you easily, both linguistically and culturally.