What moral theory or theories claims that it is impossible for diametrically opposed behaviors to be moral?

Review the assigned reading to prepare for this discussion.
Can We Be Good Without God? (opens in new window) – Craigs article is a consideration of the idea that, if God does not exist, then objective morals dont, either.
Worldview Question Six is a natural extension of question five, but more narrowly focuses on ethics. Similar to epistemology, the idea of objective morality (certain moral truths) has come under scrutiny from various perspectives.
Respond
Can two behaviors that are diametrically opposed both be moral? Explain. For example, is it ever moral to lie?
What moral theory or theories claims that it is impossible for diametrically opposed behaviors to be moral?
What moral theory or theories claims that it is possible for diametrically opposed behaviors to be moral?
Requirements
Initial posts: 250 words minimum
At least 2 sources, one from this weeks reading and one from your own research

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