Question

what was the fixed facet of religion across the roman empire?
reverence for jupiter
celebration during saturnalia
loyalty to caesar

Explanation:

In the Roman Empire, loyalty to Caesar was a fixed facet of religion. The imperial cult, which deified emperors, was a unifying religious practice across the vast empire. It symbolized political loyalty and integration. Reverence for Jupiter was part of traditional Roman polytheism but not uniformly fixed across the entire empire as a single religious facet. Saturnalia was a festival, not a fixed religious facet in the same sense as imperial loyalty.

Answer:

loyalty to Caesar