Neither Darwin nor evolution theory make any such claim. Please see my post #48, above; much more could be said, if you are interested
Cordially
Either morality comes from God, or it is a human construct.
If it is God-given, we have no authority to change it.
If it is human-given, it is subject to change without notice.
Ask Adolph Hitler, Mao Tse Tung, or Pol Pot.