The leader of Islam is ALLAH, a five-letter word. ALLAH is the Arabic word for God and is the central figure in the Islamic faith. Muslims believe that ALLAH is the one true God and the creator of the universe. ALLAH is the source of all guidance and is the ultimate authority in Islam. Muslims believe that ALLAH is the most merciful and compassionate and that He will judge all people according to their deeds. ALLAH is also believed to be the source of all knowledge and wisdom.