Does God work in our human experience or is He just a nice idea?

An attitude we may find in the West today is that God is a nice idea but has no real affect on the human experience or in human history.  He doesn't do good or ill no matter what we choose to do.  When it comes down to it, we ourselves are the real gods who define good and evil and assert our will on the world regardless of what God may say.  Boy oh boy, does the Minor Prophet Zephaniah set the record straight on this one.  Our world today isn't so different from in his day, and his message is for us as much as anyone.