Mirch, Black Magic kernay wala Deen sey mukamal kharij ho jata hai. They challenge Allah Subhan-u-hu to be-friend Satin and act 100% against the teachings. Read some books on spell casting and magic and you will understand what I meant. I think you took my words wrong. I will post the site here later and u will know.
Allah gave free hand to Satin when he disobeyed and challenged that he will deceive makhlook and Allah allowed him to do so. Otherwise, there would be no SHIR in the world.