The logic is often far-fetched - how does medical marijuana affect interstate commerce? - and some conservatives would like judges to start throwing out federal laws wholesale on commerce clause grounds. The court once again said no thanks. ↗
The real point is that totalitarian regimes have claimed jurisdiction over the whole person, and the whole society, and they don't at all believe that we should give unto Caesar that which is Caesar's and unto God that which is God's. ↗