What Is Islam? — Complete Introduction to Islam

Islam is the way of life built on submission to one God — Allah — and on the guidance He sent through prophets, completed in the message of Prophet Muhammad (ﷺ). The Arabic root s-l-m carries both "submission" and "peace": peace with the Creator produces peace within the self and with creation.

The central claim

The whole of Islam condenses into one sentence: La ilaha illa Allah, Muhammadun rasul Allah — there is no deity except Allah, and Muhammad is His Messenger. Everything else — law, ethics, worship, spirituality — unfolds from that. The Qur'an states it plainly: "Say: He is Allah, One" (112:1).

What a Muslim believes

• Tawhid — God is one, without partner, image or offspring.
• Prophethood — from Adam to Muhammad (ﷺ), God guided humanity through chosen messengers.
• Revelation — the Qur'an is God's final revealed speech, preserved in its Arabic text.
• Accountability — this life is a trust; the Hereafter is where the account is settled.

What a Muslim does

Practice is anchored in the Five Pillars: testimony of faith, prayer, fasting Ramadan, zakat, and Hajj for those able. Around these sit the wider ethics of Islam — honesty, justice, mercy to parents, neighbours and the poor.

One faith, several schools

Muslims agree on the Qur'an, the Prophet (ﷺ) and the pillars. They differ on questions of leadership after the Prophet and on methods of deriving law:

• Sunni Islam follows four legal schools (Hanafi, Maliki, Shafi'i, Hanbali) and accepts the caliphate of Abu Bakr, Umar, Uthman and Ali.
• Shia Islam (majority Ithna Ashari) holds that leadership passed by divine designation to Imam Ali and eleven Imams from his lineage, ending with Imam Mahdi.
• Salafi/Wahhabi currents are a Sunni reform movement rooted in Hanbali thought, stressing direct reliance on Qur'an and hadith and rejecting later accretions in practice.

These differences are real and should be studied honestly rather than papered over — but they sit inside a shared creed of one God, one Qur'an and one Prophet.

Where to begin

Read the Qur'an with a reliable translation, learn the prayer, and read the Prophet's biography. Understanding grows with practice, not before it.

References across the schools

• Qur'an: 2:177, 3:19, 49:13, 112:1–4.
• Sunni: Sahih al-Bukhari 8 and Sahih Muslim 16 (hadith of the five pillars); Sahih Muslim 8 (hadith of Jibril on islam, iman, ihsan).
• Shia: al-Kulayni, al-Kafi, Kitab al-Iman wa'l-Kufr (Islam built on five); al-Saduq, al-I'tiqadat.
• Salafi/Wahhabi: Muhammad ibn Abd al-Wahhab, Kitab al-Tawhid; Ibn Taymiyyah, al-Aqidah al-Wasitiyyah.