False. Allah is very real, he’s just known as “Satan” to Christians. Fun fact: after his first encounter with “Jibreel” in the cave, Mohammad was convinced he had encountered an evil jinn (basically a demon), and became suicidal. He got out of that phase after he talked to Khadijah (his first wife of many) and was persuaded that he’s actually a prophet of the Almighty, and the being that visited him was an angel. Really tells you a lot