Cicero considers the Romans to be the most religious of all nations, because they carried their religion into all the details of life. This is true; but one might as well consider himself a devout worshipper of iron or of wood, because he is always using these materials, in doors and out, in his parlor, kitchen, and stable.
As the religion of Rome had no doctrinal system, its truths were communicated mostly by spectacles and ceremonies, which chiefly consisted in the wholesale slaughter of men and animals. There was something frightful in the extent to which this was carried; for when cruelty proceeds from a principle and purpose, it is far worse than when arising from brutal passion. An angry man may beat his wife; but the deliberate, repeated, and ingenious torments of the Inquisition, the massacre of thousands of gladiators in a Roman amphitheatre, or the torture of prisoners by the North American Indians, are all parts of a system, and reinforced by considerations of propriety, duty, and religious reverence.
Mommsen remarks[270], that the Roman religion in all its details was a reflection of the Roman state. When the constitution and institutions of Rome changed, their religion changed with them. One illustration of this correspondence he finds in the fact that when the Romans admitted the people of a conquered state to become citizens of Rome, their gods were admitted with them; but in both cases the new citizens (novensides) occupied a subordinate position to the old settlers (indigites[271]).
That the races of Italy, among whom the Latin language originated, were of the same great Asiatic stock as the Greeks, Germans, Kelts, and Slavic tribes, is sufficiently proved by the unimpeachable evidence of language. The old Latin roots and grammatic forms all retain the analogies of the Aryan families. Their gods and their religion bear marks of the same origin, yet with a special and marked development.