JTT and
Thomas: I disagree. The first commandment merely commands a belief in god. The rituals that go along with that belief are not implicit in the commandment, since the commandment itself doesn't say anything about conduct. The first commandment, in effect, says that you have to belong to the club, but the pentateuch is the club's rulebook.
Furthermore, if the first commandment subsumes all of the rituals incumbent upon the worship of god, what is the status of those rituals that
predate the first commandment (e.g. male circumcision)? Do they get grandfathered in?
Indeed, since the rituals are owed only to god, it's questionable whether even
those are ethical in nature. Ethics, after all, are usually viewed as a human's duties to
all other humans, not just to all other co-religionists. In addition, calling religious rituals "ethical" in nature would mean that a totally isolated (but religious) individual would still have ethical obligations, which strikes me as doubtful. If someone, for instance, eats a rabbit, which is
unclean according to Leviticus, he has not injured anyone else: he has only sinned against god. As such, that's more like breaking the club's rules than violating an ethical obligation.
Even if we view the rituals as ethical obligations, that still doesn't mean that the rituals are contained within the first commandment. Someone, after all, can obey the commandment but not fulfill the rituals, just as someone can fulfill the rituals but not obey the commandment. To me, that's a pretty clear indication that the commandment and the rituals cover different things. The commandment concerns belief, the rituals concern conduct.