How Did God Become a Swear Word?

     Why did we start to say “Oh my God” as an exclamation of shock or surprise, rather than invoking something like “Oh my Gordon” or “Oh my Gladys”? Is it because we don’t believe in him, so what does it matter? But if God doesn’t exist, why use his name as the most powerful word there is to express shock or surprise? And why say “MY God,” claiming God is yours if he doesn’t exist?       
     Here’s another oddity.   We say “God damn” to express anger. Are we asking God to condem...