In the mid - 15th century, what factors contributed to a slight loosening of false religion’s grip on the people?
أَيُّ عَامِلَيْنِ أَضْعَفَا قَبْضَةَ بَابِلَ ٱلْعَظِيمَةِ فِي مُنْتَصَفِ ٱلْقَرْنِ ٱلْخَامِسَ عَشَرَ ؟‏