Question: Why do some people curse Islaam? What is the ruling on them especially if they are blood relatives; for instance a brother or a father? What is the ruling on the shrines of Ibraaheem Al-Dusooqee, Al-Sayyid Al-Badawee, and Al-Husayn? Finally, what is the ruling on Masaajid (mosques) that contain graves? Do they fall under the Hadeeth in which the Messenger (peace be upon him) said what means, Let the curse of Allaah be upon the Jews and the Christians, for they have taken the graves of their Prophets as places of worship ?
Answer: First of all, cursing Islaam is an act of serious Riddah (apostasy) in case the person who curses claims to be a Muslim… read more here.