Mystery Religions and Christianity
The religions in the ancient world had strange names. Some folks worshiped a god named Mithra(s), others the deities of Osiris and Isis, and still others worshiped Dionysus. What makes things more interesting is that these religions borrowed heavily from each other. The same deity might end up having multiple names. It is difficult to speak of common features of these diverse religions because there were so many differences. Yet many skeptics of Christianity claim to see common elements between the mysteries and Christianity.
The clear evidence is that this is not the case. Rather, the mysteries share far greater commonality with each other then they do with Christianity. In the Hellensitic age, the common thread among these religious was that they all had "secret ceremonies," mysteries to all but the initiated. These mysteries brought "salvation" to the participants. The major mystery religions included the Greek worship of Dionysus and Demeter and the later Elusinian and Orphic mystery cults.
In Phrygia (modern central Turkey) arose the cult of Cybele and Attis. Egypt contributed the cult Isis and Osiris. From Palestine and Syria came the mystery worship of Adonis and finally Mithraism, whose origin is disputed. Strange names, strange places, and stranger deities. Do they have anything to do with Christianity? The mysteries (excluding Mithraism) had five characteristics in common:
1. At the core of each mystery was the annual vegetation cycle in which "life is renewed each spring and dies each fall. Followers of the mystery cults found deep symbolic significance in the natural processes of growth, death, decay, and rebirth.
2. Each cult made "important use of secret ceremonies or mysteries, often in connection with an initiation rite... every mystery religion also 'imparted a "secret," a knowledge of the life of the deity and the means of union with him."' This "knowledge" was always an esoteric or secret teaching, unattainable by anyone outside the circle of the cult.
3. The focus of the myth of each mystery was on the deity's victory over something. This could be a return to life or conquest over his enemies. “Implicit in the myth was the theme of redemption from everything earthly and temporal. The secret meaning of the cult and its accompanying myth was expressed in a 'Sacramental drama'” that appealed largely to the feelings of the initiates. Most importantly, the vegetation cycle dictated this sense of “rebirth” and new life.
4. Doctrine and correct belief had little importance. Cults were primarily concerned with emotions. “Processions, fasting, a play, acts of purification, blazing lights, and esoteric liturgies” stirred emotional frenzy that brought one into union with the god.
“The immediate goal for the initiates was a mystical experience that led them to feel they had achieved union with their god.... Beyond this quest for mystical union were two more ultimate goals: some kind of redemptive or salvation, and immortality.”
There are similarities to Christianity in these elements, but the differences are greater. Both recognize the triumph of their deity as an important aspect of the religion, and both placed an emphasis on salvation. Such features are common to most religions. But what set Christianity apart was:
(1) its insistence on historical credibility, which the mysteries didn't even pretend to have, versus the “going nowhere” view of the vegetation cycle;
(2) Christian proclamation of the gospel as accessible to all people;
(3) its insistence of right belief instead of emotional frenzy; and
(4) the centrality of the death and resurrection of Jesus Christ and the coming resurrection of believers.
As Robin Lane Fox has noted, while the mysteries “offered a myth of their god, Jews and Christians offered history; the pagan mysteries conveyed a secret experience, whereas Jew and Christians offered 'revelation' based on text.” Other difference could be mentioned, such as the Christian faith's exclusiveness. Christians proclaimed that their there is only one legitimate path to God and salvation, Jesus Christ. The mysteries were inclusive. Nothing prevented a believer in one cult from following other mysteries as well.
The mystery religions had for more common with each other than any of them had with Christianity. Yet, the mystery cults took note of the Christian movement and started to emulate it. Only after A. D. 100 did the mysteries begin to look very much life Christianity, precisely because their existence was threatened by this new religion. They had to compete to survive.
(Note: The information provided in this thread derived from the book entitled, "Reinventing Jesus," authored by J. Ed Komoszewski, M. James Sawyer, and Daniel B. Wallace on pages 235 through 237.)