Secular humanism states that there are no divine absolutes so there are no absolute standards of right and wrong, which leads to subjectivism, which leads to ethical relativism, situation ethics, cultural relativism, new morality, experimental lifestyles, moral equivalency, and permissive morality.
Postmodernism states that there is no universal objective truth. No one knows what is right or best for another adult.There is only the truth of the particular group one belongs to, which leads to cultural and social relativism.
Christian ethics in based on moral absolutes based on God's character or moral decree, which is the final standard.
The great evil irony is ‘they’ mock and say no to God’s absolute morality while creating their own absolute morality—not to be disagreed or argued with. Marx said the best manipulation is accusing another or what you are doing. The libs do this in spades. (Can we still say in spades btw?) :D