Answer:
Divine Command Theory (DCT) is a theory that stands to say that something is morally acceptable simply "because God says so."
(ie: To donate to charity is "good." What makes giving to charity good? "Because God commands it.")
Cultural Relativism/Ethnocentrism (CR) is a theory that states that there is no universal code for morality, rather that one's cultural upbringing determines morality.
(ie: Just because Americans do not traditionally practice cannibalism, that does not make it morally wrong. Other cultures are raised to think this is a natural and normal practice.)
Hope this answers your question!