Question 6: What is the ruling on people who blaspheme religion, even if they are first-degree relatives (father, brother, and so on)? What is the legal ruling on graves that are in Masjids (Mosques) such as, Ibrahim Al-Dusooqee, Al-Sayyid Al-Badawee, Al-Husayn, and so on? What is the ruling on Masjids that have graves inside them? Does the Hadeeth of the Messenger (peace be upon him), “May Allaah curse the Jews and the Christians, for they have taken the graves of their Prophets as places of worship” apply to them?
Answer: First, blaspheming the religion of Islaam is Kufr (disbelief). Whoever hears anyone doing so, should forbid this Munkar (that which is unacceptable or disapproved of by Islamic law and Muslims of sound intellect) and… read more here.