The Test That Broke Christians and Jews

Participation in imperial cult ritual, above all offering sacrifice or incense before an image of the emperor, became the practical test Roman authorities periodically used to identify and prosecute Christians during the empire's various periods of persecution, since Christian monotheism held such an act to be idolatrous regardless of whether individual participants or officials understood it as full blown worship of the emperor as a god or as simple civic loyalty, a conflict that made refusal to sacrifice a defining, documented marker of Christian identity and, for those who refused, frequently a capital offence.

Judaism secured a distinctive, formally negotiated exemption from direct participation in the cult across most of the empire's history, permitted instead to offer sacrifice to their own God on the emperor's behalf rather than sacrifice to the emperor directly, an accommodation that held, with significant strain, until the Jewish revolts against Rome broke down the wider relationship in the first and second centuries. The imperial cult declined and was formally ended following Christianity's establishment as the favoured and then the mandated religion of the Roman state through the fourth century, a documented historical institution that ended with the empire's religious transformation rather than surviving in any continuous living form into the present.