On the other hand, we find similar conceptions in Christianity. The society of the faithful—the term is still in use—is the "Church Militant." During the first centuries the comparison of the church with an army was carried out even in details;[[5]] the baptism of the neophyte was the oath of fidelity to the flag taken by the recruits. Christ was the "emperor," the commander-in-chief, of his disciples, who formed cohorts triumphing under his command over the demons; the apostates were deserters; the sanctuaries, camps; the pious practices, drills and sentry-duty, and so on.
If we consider that the gospel preached peace, that for a long time the Christians felt a repugnance to military service, where their faith was threatened, we are tempted to admit a priori an influence of the belligerent cult of Mithra upon Christian thought.
But this is not the case. The theme of the militia Christi appears in the oldest ecclesiastical authors, in the epistles of St. Clement and even in those of St. Paul. It is impossible to admit an imitation of the Mithraic mysteries then, because at that period they had no importance whatever.
But if we extend our researches to the history of that notion, we shall find that, at least under the empire, the mystics of Isis were also regarded as forming sacred cohorts enlisted in the service of the goddess, that previously in the Stoic philosophy human existence was frequently likened to a campaign, and that even the astrologers called the man who submitted to destiny and renounced all revolt a "soldier of fate."[[6]]
This conception of life, especially of religious life, was therefore very popular from the beginning of our era. It was manifestly prior both to Christianity and to Mithraism. It developed in the military monarchies of the Asiatic Diadochi. Here the soldier was no longer a citizen defending his country, but in most instances a volunteer bound by a sacred vow to the person of his king. In the martial states that fought for the heritage of the Achemenides this personal devotion dominated or displaced all national feeling. We know the oaths taken by those subjects to their deified kings.[[7]] They agreed to defend and uphold them even at the cost of their own lives, and always to have the same friends and the same enemies as they; they dedicated to them not only their actions and words, but their very thoughts. Their duty was a complete abandonment of their personality in favor of those monarchs who were held the equals of the gods. The sacred militia of the mysteries was nothing but this civic
morality viewed from the religious standpoint. It confounded loyalty with piety.
As we see, the researches into the doctrines or practices common to Christianity and the Oriental mysteries lead almost always beyond the limits of the Roman empire into the Hellenistic Orient. The religious conceptions which imposed themselves on Latin Europe under the Cæsars[[8]] were developed there, and it is there we must look for the key to enigmas still unsolved. It is true that at present nothing is more obscure than the history of the religions that arose in Asia when Greek culture came in contact with barbarian theology. It is rarely possible to formulate satisfactory conclusions with any degree of certainty, and before further discoveries are made we shall frequently be compelled to weigh contrasting probabilities. We must frequently throw out the sounding line into the shifting sea of possibility in order to find secure anchorage. But at any rate we perceive with sufficient distinctness the direction in which the investigations must be pursued.
It is our belief that the main point to be cleared up is the composite religion of those Jewish or Jewish-pagan communities, the worshipers of Hypsistos, the Sabbatists, the Sabaziasts and others in which the new creed took root during the apostolic age. In those communities the Mosaic law had become adapted to the sacred usages of the Gentiles even before the beginning of our era, and monotheism had made concessions to idolatry. Many beliefs of the ancient Orient, as for instance the ideas of Persian dualism regarding the infernal world, arrived in Europe by two roads, the more or less orthodox Judaism of the communities of
the dispersion in which the gospel was accepted immediately, and the pagan mysteries imported from Syria or Asia Minor. Certain similarities that surprised and shocked the apologists will cease to look strange as soon as we reach the distant sources of the channels that reunited at Rome.