Beyond the normative, historical, and apocalyptic prescripts they contain, Islamic scriptures have what can only be described as a distinctive Islamic understanding of anthropology, sociology, and psychology. Here, the world is comprised of two fundamentally distinct parties: those who believe and live by the law of God, and those who don't - the latter must be variously transformed into the former, suppressed, or exterminated. The believing, obedient peoples are the members of the Muslim
ummah, or nation, which enjoys a global unity. The lands of these people comprise the
dar al-Islam, or Abode of Islam - the rest of the Earth, until it can be transformed, is ultimately the
dar al-harb, or Abode of War. Tactical and temporary alliances with non-Muslim entities may, however, be permissible. All humans are born upon the
fitrah, which is the natural instinct to believe in and obey the Islamic God - children's un-Islamic upbringings, however, numb them to this instinct. They can, however, be called back to this - this invitation is known as
Da'wah. This Da'wah can be anything from an intellectual to a military enterprise - Indeed, per a quote from Muhammad recorded in Sahih Bukhari, some people will be dragged to "Paradise in chains".
[2] Since true religion cannot follow from compulsion, the Muslim
Ummah is tasked only with achieving the extrinsic and perceptible evidences of faith and
khilafah, or holy empire - persons may be punished or rewarded for what they say, but the true proving grounds of submission are, incontrovertibly, in the heart.
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Quran 2:256 famously opens, "There is no compulsion in religion". While some modern interpretations have read this verse to contain legislative value, suggesting that the death penalty traditionally prescribed by consensus for apostasy is somehow not applicable. Historically, however, this verse was either read as having been abrogated (for instance, by Ibn Kathir), or read as descriptive rather than legislative - that is, it was understood to simply mean that a person could not be forced to believe (as this is plainly impossible), without commenting on the consequences of their refusal to believe.
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Ummah (أمة) is an Arabic word meaning "community" or "nation". In Islam the word is used to refer to the collective worldwide body of Muslim believers, including both the Muslim population of Dar al-Islam and the Muslim population of Dar al-Harb who are living outside the lands where Islam rules. The leader of the ummah is known as the is theoretically to be the Caliph, "Amir Al-Mu'minin" or "Commander of the Believers", although no widely-accepted figure has held this position since the fall of the Ottoman caliphate after the end of the World War I.
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Fitrah (فطرة) is a term in Islamic theology which has many interpretations. The most popular interpretation today is that it's a natural human disposition to believe in Islam.
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Da'wah (دعوة) literally translates from Arabic to mean "invitation", but is usually used as an Islamic term which refers to Islamic proselytism. Similarly, a Da'ee is someone who "invites" to Islam, or carries out the Islamic proselytization. Da'wah can refer to both "external" and "internal" proselytism, as it is considered equally meritorious in Islam to invite a non-Muslim to Islam as it is to invite a non-practicing Muslim to practice Islam. Some of the biggest Da'wah movements (like the Tablighi Jamaat in Pakistan), as a result, focus almost exclusively on spreading Islamic practice among a population that is already Muslim.