I don’t have to believe in God, to comprehend the fact, that the definition of God is that God is the origin of everything. I don’t have to be a theist to know that (demi) gods are the creation of God. The largest polytheist group today, are the Hindus. They worship different gods. But they also worship Vishnu, as the origin of everything, including gods. They didn’t just decide to do it. It is a part of their culture. Nothing is made up. So do you accept the definition of God. Or are you unable to?