Islam and blasphemyIn Islam, blasphemy is impious utterance or action concerning God, but is broader than in normal English usage, including not only the mocking or vilifying of attributes of Islam but denying any of the fundamental beliefs of the religion. Examples include denying that the Quran was divinely revealed, the Prophethood of one of the Islamic prophets, insulting an angel, or maintaining God had a son. The Quran curses those who commit blasphemy and promises blasphemers humiliation in the Hereafter.
BlasphemyBlasphemy, as defined in some religions or religion-based laws, is an insult that shows contempt, disrespect or lack of reverence concerning a deity, an object considered sacred or something considered inviolable. Some religions regard blasphemy as a religious crime, especially the Abrahamic religions, including insulting the Islamic prophet Muhammad in Islam, speaking the "sacred name" in Judaism, and the "eternal sin" in Christianity.
Religious intoleranceReligious intolerance is intolerance of another's religious beliefs, practices, or lack thereof. Statements which are contrary to one's religious beliefs do not constitute intolerance. Religious intolerance, rather, occurs when a person or group (e.g., a society, a religious group, a non-religious group) specifically refuses to tolerate the religious convictions and practices of a religious group or individual. The intolerance, and even the active persecution of religious minorities (sometimes religious majorities as in modern Bahrain or the Pre-Dutch Indonesian kingdoms), has a long history.
ApostasyApostasy (əˈpɒstəsi; ἀποστασία , 'a defection or revolt') is the formal disaffiliation from, abandonment of, or renunciation of a religion by a person. It can also be defined within the broader context of embracing an opinion that is contrary to one's previous religious beliefs. One who undertakes apostasy is known as an apostate. Undertaking apostasy is called apostatizing (or apostasizing – also spelled apostacizing).
HeresyHeresy is any belief or theory that is strongly at variance with established beliefs or customs, particularly the accepted beliefs or religious law of a religious organization. A heretic is a proponent of heresy. Heresy in Christianity, Judaism, and Islam has at times been met with censure ranging from excommunication to the death penalty. Heresy is distinct from apostasy, which is the explicit renunciation of one's religion, principles or cause; and from blasphemy, which is an impious utterance or action concerning God or sacred things.