God is the one true God. Allah is a false god that the Muslims worship. When Muhammad made up his story and started conquering, he couldn’t defeat the Arab Pagans that had long worshiped their pantheon of gods, of which the chief god was named “Allah”, the moon god. They came to a compromise and he said they could keep one of their gods. That’s why the Muslims say “there is only one god, and his name is Allah”. It was a saying to teach the pagans to only worship their one god Allah. That is also why the symbol of Islam is a crescent moon, because Allah was the moon god. Allah is a false pagan god.