anon,
First like Mr. Schwab mentioned, social host laws represent a small minority of jurisdictions. Second, Mr. Schwab didn’t just describe the law, he quoted it. And yes it may be big enough to drive a truck through, but that is the law of the land as passed by the legislature. Third, a court would be obligated, if necessary, to evaluate a claim to have a ”sincerely held religious belief”, and perhaps the reason we haven’t heard a prosecutor bring such a case is precisely that – the drinking is legit and like you said you could drive a truck through it, and neither a prosecutor nor a court really want to deal with a case that delves into religious claims – so they naturally avoid it, especially considering it is a strong legal defense.
Bottom line? L’Chaim!