That is an interpretation. In Islam, I know you had a concept of lying then you had "Taqiya", which included lying if you can save lives or did it out of fear of your own life. I'm not sure how Christians interpret the command not to lie, but it can be, that it is a general rule, and has it's exceptions.
Anyways, Divine command theory is possible without the Bible or Torah or a Holy Book. It can be stating that our morality is a command from God.
Anyways, Divine command theory is possible without the Bible or Torah or a Holy Book. It can be stating that our morality is a command from God.