Is a man's saying "No Fatiha, no Ghamiqah," in a context of anger, considered apostasy, knowing that the intention was not to mock the Surah? And is it obligatory for a repentant person to make up past acts of worship?

A Muslim should venerate his religion and the Book of Allah. The righteous predecessors paused at the Book of Allah, such as Umar ibn al-Khattab and Harun al-Rashid. Whoever has issued an answer comparing Surat Al-Fatiha to "the dark one" must repent, seek forgiveness, and perform righteous deeds. He must also make up for any missed acts of worship and fulfill his obligations to Allah and His creation.