The Qur’an contains numerous stories that are known to be taken from ancient forgeries. The Qur’an even acknowledges that Muhammad’s contemporaries repeatedly accused him of copying his stories from earlier sources (see Quran 6:25, 8:31, 16:24, 46:17, 68:15, 83:13, etc.). Do these forgeries call into question the reliability of Muhammad? Here’s my discussion on this topic with Shabir Ally in our debate on whether Muhammad gives the truth about Jesus.