This is because God's Mercy is always willing to call back...
YOU MAKE NOT TO HEAR EXCEPT HE WHO BELIEVES IN OUR SIGNS, AND THOSE WHO SURRENDER THEMSELVES TO US. (THE MUSLIMS) [ 535 ] THE COMMENTARY DEAFS AND BLINDS WILL NOT CATCH YOUR WORD VERSE NO.76ِ81 The Israelites were at variance in many important matters, such as Mary the Virgin, Jesus Christ, the Messiah to come, and many a commandment of the Law.
Qura"n revealed, and declares most of such differences which is a real guidance and true Mercy for those who do believe in Qura"n:ِ ``Verily this Qura"n makes clear to the Israelites most of that in which they are at variance.'' The Jews and Christians have numerous sects with different ideas even in their orthodox body.
They have various scriptures with important conflicts in their texts, some of which have canonically been approved and accepted as true, and some have been rejected like the Gospel of Barnabas which proves to be more truthful. Both of the main groups of the Mosaic Law (JEWS AND CHRISTIANS) have a large volume of traditions with which they have overlaid the Law of Moses.
This is where Jesus has said:ِ ``Do not think that I have come to do away with the Law of Moses, and the teachings of the prophets. I have rather come to make their teachings to come true.