Tawhid (Islamic monotheism), which depicts the ultimate oneness of the Divine Reality who rules this world and is the sole reason for our existence, is regarded in Islam as the Truth of the cosmos. The ultimate evil, however, is shirk (idolatry), in which divinity is shared by numerous beings and our existence lacks a distinct meaning. The Islamic worldview is based on these two core ideas, and all of its offshoots may be traced to this historical foundation. The holy Quran is clear in its words, “And We certainly sent into every nation a messenger, [saying], “Worship Allah [alone] and avoid Taghut (idols, false deities).” And among them were those whom Allah guided, and among them were those upon whom error was [deservedly] decreed. So proceed through the earth and observe how was the end of the deniers.” Since Allah is self-sufficient and has no needs, His mandates and prohibitions are based on what we require. The second tenet is that since Allah cannot profit or lose from what His creatures do, whatever He orders or forbids is based on what is good for and bad for us. Because of this, the Qur’an refers to revelation as a mercy, a light, a guidance, and a cure for humanity. The third tenet is that because Allah is Al-Haqq (The Truth or The Real), the extent of good and evil depends on what goes against His nature. Above all, He is Ahad (The only one) whom we worship. Denying the ontological reality of God’s oneness by multiplying divine entities is the greatest transgression of God’s nature. Because all of God’s traits are ontologically related to one another, this is the worst possible offence. Therefore, if Allah is truly Just, shirk must be outlawed and punished. It should receive the harshest punishment possible because it is the worst crime. Must we remember that the foundation of Tawhid contains the greatest of all good, and the shirk contains the worst of all evil.