Another factor is that Christianity is exclusive—one could not adhere to Christianity and, say, Mithraism at the same time, since Christianity claimed a monopoly on religious truth. Other saviour cults which did not function in the same way would not have been able to work up the same amount of religious fervour, since a man’s trust in his religion is limited by that religion’s trust in itself.
Another factor is that Christianity is exclusive—one could not adhere to Christianity and, say, Mithraism at the same time, since Christianity claimed a monopoly on religious truth. Other saviour cults which did not function in the same way would not have been able to work up the same amount of religious fervour, since a man’s trust in his religion is limited by that religion’s trust in itself.