Questions of morality and ethics figure highly in theist arguments against atheism. Questions like “Why are we moral?”, “Where does our morality come from?” and “How do we decide the correctness or otherwise of moral decisions?”
Theist answers to these question are usually along the line that their god created humanity as a moral species. We either know what is “right” and “wrong” or this is “revealed” to us, or our religious leaders, by our god. Of course, these arguments don’t convince non-theists. I suggest, however, they should not convince theists either, particularly modern Christians.