Islam is the religion of truth and it highlights and teaches us how to govern and live our lives. When it comes to dealings with the non-Muslims we are given detailed teachings for that as well. That being said, distinction has to be made between the worldly life and the life of the hereafter. We deal with everyone with utmost justice, pristine smiles, and the best of manners. But that does not change the theological facts that have been established for non-Muslims.