But besides this development we have the more important development of the concrete mystery gods. These mystery gods, are monotheistic. He who is initiated into such a mystery has a concrete God who is at the same time the only God. But one can be initiated into more than one mystery, which means that the figures of the mystery gods are exchangeable. There is nothing of the Old Testament exclusiveness of Yahweh. These mystery gods had greatly influenced Christian cult and theology. If somebody is initiated into a mystery as later on the Christians initiated the congregations by steps then he participates in the mystery god and the experiences which the mystery god has. These experiences are described by Paul in Romans 6 with respect to Jesus, namely participation in the death and the resurrection of the mystery god. This is the ecstatic experience which is produced in the mystery activities. In the devotional services, in which those who belong to it are brought into a state of deep sorrow about the death of the god, about the tragic reality in which even the god is involved, and after a certain time experience the ecstatic experience of the god resurrected, in which the individual participates for resurrection himself. This presupposes that the idea of the suffering god is described in these mysteries. Since the Delphic Apollo, we have the idea of the participation of God in the suffering of man: Apollo at Delphi has to pay for the guilt of slaying the powers of the underworld, which have their own right, themselves. Then we have the methods of introduction through psychological means: intoxication; by a change of light and darkness; by ascetic fasting; by incense, sounds, music, etc. all similar to what we can experience every Sunday in a Catholic cathedral.