Question: Some people may say, “Let’s recite Al-Faatihah for the soul of so-and-so!” or “Let’s recite Al-Faatihah for Allaah to make such-and-such work easy for us!” People then start reciting Al-Faatihah. Besides, a person may say, “Let’s recite Al-Faatihah” after he finishes reciting the Qur’aan. The listeners then start reciting Al-Faatihah. Also it is a habit of some people to recite Al-Faatihah as a betrothal ceremony. What is the ruling on all these deeds?
Answer: Reciting Al-Faatihah by the listeners after invoking Allaah, reciting the Qur’aan or as a betrothal ceremony is a Bid`ah (innovation in religion). None of these deeds is authentically reported from the Prophet (peace and blessings of Allaah be upon him) or any of his Sahaabah (Companions) (may Allaah be pleased with them)… read more here.