How do you know that the Devil isn't just like God?

The god of the old testament is "The devil." He imprisoned spiritual beings in flesh bodies and tried to keep from them the knowledge of their spiritual nature ( the tree of life, the tree of the knowledge of good and evil.) It was only the good force in the universe, derided as the serpent in the old testament and as Jesus in the New, who tried to save us from a Devil who wanted to keep us in servitude doing nothing but sitting around telling him how cool he is.