Religious laws are supposedly the word of god(s). If these laws are to be followed for any reason, then it must be assumed that they are always relevant (since to the best of my knowledge, there is no passage in any holy book that says "disregard these laws if a certain degree of technological or cultural proficiency has been obtained") or not to be followed (since some of the laws do contradict the current moral zeitgeist). Basically, what I'm trying to say is that by following these laws because they come from god, then you are assuming they are the words of god. If they are, then you must follow all of them (because any holy book says so), and if not, you don't have to follow any of them. It doesn't make sense to say "I condemn homosexuality because the bible says so, but I condone working on the Sabbath even though the bible says that is a sin as well". Of course, the exception to this would be people who follow religious laws not out of belief in god.