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We usually define members of religions by using a kind of checklist. For instance, one could say that if someone believes in the Trinity and incarnation, she is a member of the religion Christianity, but if she doesn’t, she isn’t a proper member of that religion. One could say, conversely, that if someone does not believe in the Trinity and incarnation, then he is a member of the religion Judaism, but if he does believe in those things, he isn’t. One could also say that if someone keeps the Sabbath on Saturday, eats only kosher food, and circumcises her sons, she is a member of the Jewish religion, but if she doesn’t, she is not a member of the Jewish religion. Or, conversely again, if some group believes that everyone should keep the Sabbath, eat only kosher food, and circumcise sons, they are not Christians, but if they believe that these practices have been superseded, then they are Christians. This is, as I have said, our usual way of looking at such matters.
However, this manner of categorizing people’s religions runs into difficulties. First, someone has to be making the checklists. Who decides what specific beliefs disqualify a person from being a Jew? Throughout history these decisions have been made by certain groups of people or individuals and are then imposed on other people (who may, however, refuse—unless the deciders have an army). It’s a little bit like those “race” checklists on the census forms. Some of us simply refuse to check a box that defines us as Caucasian or Hispanic or African American because we don’t identify that way, and only laws, and courts, or an army could force us to if they chose to. Of course, it will be asserted that the decisions about Jews and Christians (not Americans) were made by God and revealed in this Scripture or that, by this prophet or that, but this is a matter of faith, not of scholarship. Neither faith nor theology should play a role in the attempt to describe what was, as opposed to what ought to have been (according to this religious authority or another).
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