What difference does it make if they buy alcohol on Saturday to drink on Sunday? These moral laws concerning Sunday is a pushing of one's religious belief on another. Alcohol is a legal substance, prohibiting sale on Sunday is symbolic. If you believe you shouldn't drink, don't. If you believe you shouldn't buy alcohol on Sunday, don't. But to interfer in the sales on one day of the week is symbolic at best of a particular religious belief and should be considered a violation of the separation of church and state.