Question 103: I am living in a house where a man resides with me. He shaves his beard from time to time, lies, and blasphemes. To sum up, he is suffering some signs of hypocrisy, may Allaah protect us! It happened that he blasphemed by insulting religion seven or eight times in ten minutes. Is it permissible to greet him with the salutation of Islaam while I hate him? Should I greet him back when he greets me? Please, tell the legal decision?
Answer: According to the legal texts of the Qur’aan and Sunnah, and the consensus of opinions, blasphemy – Allaah forbid – is an act of open disbelief. Allaah says: “Was it at Allaah (عز وجل), and His Aayaat (proofs, evidence, verses, lessons, signs, revelations) and His Messenger (صلى الله عليه وسلم) that you were mocking?” Make no excuse; you disbelieved after you had believed. There are other similar declarations in this regard. That person should be advised and rebuked; if he responds positively and accepts the advice, praise be to Allaah. But if not, it is not permissible to greet blasphemers or respond to their greeting or invitation. They should be deserted fully until they repent; otherwise, they shall be sentenced to death as judged by Allaah. The Prophet says: If a Muslim discards his religion, kill him. Related by Al-Bukhaaree in his Saheeh (book of sound Hadeeths) on the authority of Ibn `Abbaas (may Allaah be pleased with them both). It is admittedly true that a Muslim who insulting Islaam and discards the religion, is apostate... read more here.