The purpose of Bible FAQ is to answer questions about the Bible and about how to live according to Biblical guidelines. Since the National Sunday Law is not found in the Bible, but seems to be a political question, I would encourage you to research it on reputable sources. Many people will search the internet and be indiscriminate about the origin of the information. It’s apparent that there are many conflicting thoughts represented on the web.
I googled the topic, myself, and found several different ideas about the National Sunday Law. So, please be careful about the veracity of your source material if you choose to research the question.