It was mostly for you.
The relativist argument that without revelation, the law is unknowable is something I once accepted as logical until I understood it isn't biblical. If something is true, it can be discovered with other methods.
I believe the concept that non Christians cannot know law is unbiblical. Apparently it is in their hearts too. They have the knowledge and conscience to know that they fall short of the law.
By understanding the law exists and that they fall short of it, they end up guilty and in need of a savior.
I never talked about law. The word law is not the same as the word morality.
If there is a law, and you break it, and you are caught, you have consequences. The law itself may be immoral.
On the other hand, if there is no morality, then there is only actions and consequences. An unapprended murderer would not be right or wrong, just unapprehended.