The Formless God gives each culture and society prophets and saints who proclaim a message and live their lives in such a way that others might come to know the Formless God, to understand the purpose of life and to give them ways and means of reaching the goal of life.
Islam, (meaning to submit) came about when the Angel Gabriel dictated the Koran to the Prophet Muhammed. It was created cuz it was meant to be. It was created by Muhammad. That's all that u need to know