God was the Israelites God and King. When God would communicate directly to humans via the Ark. Israel wanted their own King to lead them, NOT GOD. So they asked God for a King to lead them. God tried to warn them, but they would not listen. So God left them and granted them a KING to rule over them, instead of Himself. We are in the situation we are in today, because we chose man to rule over us instead of God, and now that we are suffering the consequences of our own actions, we ask "Why God?" Humans wanted Kings to rule over them and NOT GOD, and now we see the results of that action.
satan and demons are the god of this world, hence the reason this world is in the condition it is. Sure they grant powers to the living, but in the end their souls belong to satan. live it up now, torment forever after. Stupid choice, but God gave you free will to make even dumb decisions