Islam is a diverse religion with many expressions, though unfortunately there is a demonstrable tendency among Muslims to assume only one legitimate interpretation of Islam. On account of this, many Muslims accuse one another of apostasy, whether peaceful Muslims disavowing radical Muslims or vice versa. The reality is that Islam can be formulated either peacefully or violently, but violent expressions of Islam adhere more consistently and more literally to the foundational texts of the Islamic faith, the Quran and the hadith.
