God, the Exalted, says: "Then set your face upright for...
God, the Exalted, says: "Then set your face upright for religion in the right state, the nature made by Allah in which He has made men. There is no alteration in Allah's creation. That is the right religion but most people do not know." (30:30) And He, the Exalted, says: "Say: O people! Indeed there has come to you the truth from your Lord ..." (10:108) And He, the Exalted, says: "O you who believe!
Answer (the call of) Allah and the Apostle when he calls you to that which gives you life, and know that Allah intervenes between man and his heart, and that to Him you shall be gathered." (8:24) And He, the Exalted, says: "Those who follow the Apostle Prophet, who was taught neither to read nor to write, whom they find written down with them in the Tawra'h and the Inji'l [Old and New Testaments], (who) enjoins them to do good and forbids them from doing evil, and makes the pure and good things ala'l [lawful] for them and makes impure and harmful things ara'm [prohibited] for them, and remove from them their burden and the shackles which were upon them.
So (as for) those who believe in him and support him and help him and follow the light which was sent down with him, they are indeed the saved." (7:157) The proof of this argument is the same one that proves its attribution to the Great Creator as it proves for this Creator all attributes of knowledge about all facts and full, absolute control over the formation of shari'`ah (the comprehensive body of Islamic rules), and perfect kindness to the servants and other attributes which are not imaginable for any body other than Him the Exalted.
We are not to present any reasoning for this but only point to the Holy Qur'a'n's emphasis on this fact in all occasions when it points to Allah's kindness and knowledge: "Does He not know Who He created? He it is Who made the earth smooth for you, therefore go about in the spacious sides thereof, and eat of His sustenance, and to Him is the return after death." (67:14-15) "Say: Allah suffices as a witness between me and you. Surely He is Aware of His servants, Seeing.
And whomsoever Allah guides, is the follower of the right way, and whomsoever He causes to err, you shall not find for him guardians besides Him. And We will gather them together on the day of resurrection on their faces, blind and dumb and deaf.