In many things Islam and Mormonism share similar beliefs, such as the need for daily prayer, charity, fasting, and the importance of prophets. However, our understanding of our relationship with God is quite different. Islam teaches man is a creation of God created to worship Him. Mormonism teaches that man is the literal spiritual offspring of God, sent to earth to learn and become more like Him. As I read the Quran I wonder what the point to leaving sinners upon this earth is? It is clearly stated therein that God will lead whomever he wills to belief or to unbelief. Though Muslims may try to warn the unbeliever of the coming punishment they are told not to plead for them because if God has destined someone for punishment they will not repent. I suppose He does show mercy by letting them enjoy as much of this life as they can prior to being thrust into hellfire, but why even create something knowing it will be disobedient in the first place?
To me, it makes more sense for a Father to have patience for and work with man if they are His children. Though He knows them and what they will most likely end up doing, He doesn't predestine them for punishment. He works with them until they condemned themselves through their choice to be disobedient. To me this seems much more just.
Granted, I could be wrong in my interpretation. I've only studied Islam casually for a couple of years, whereas Mormonism has consumed my life from the beginning.