Here is an interesting exchange between Christian philosopher William Lane Craig and atheist Dr. Bernard Leikind. When pressed about how he accounts for moral values and duties, Dr Leikind struggles to put together a cogent case.
The fact is, objective moral values and duties do exist. We all know that. And we know it because we’re created in the image of God.
When you deny the existence of God, you get caught up in the absurd and inconsistent circles of reasoning you find in this video: