Theists and even deists often refrain from explicitly defining god, because doing so would subject your specific definition of god to be refuted. It's an interesting tactic I guess but easy to spot. Once we can define god, specifically, we can determine whether or not said god is real.
If you're frightened of dying, and you're holding on, you'll see devils tearing your life away. But if you've made your peace, then the devils are really angels, freeing you from the Earth.