I'm guessing the answer has something to do with the reasoning behind how the Hobby Lobby case was decided, though this probably predates that by many years. Hobby Lobby didn't come out of nowhere. It comes down to sincerely held religious belief. Because of the First Amendment, the government can't tell you that your sincerely held religious belief is wrong in a case where they would be enforcing a law or regulation against you. There are obviously exceptions to this, which help to keep human sacrifice illegal, but that is likely the legal doctrine that applies here.