In contrast to the modern theology which has energetically eliminated from its content all religious elements, there is the contemporary phenomenon of an increased and unexpected interest for all religious matters. We witness two simultaneous, although unequally spread processes: the progressing secularisation and the ever increasing interest for and awakening of religion in the world. However, this recently renascent interest for the religious phenomenon does not take place in favour of Christianity, but of other non-christian religions which have better preserved in themselves the naturally religious content. In this article the most important non-christian sects and movements in the United States (Transcendental Meditation ,Hare Krishne, Mission of Divine Light, 3HO, Zen-Buddhism, tibetan Buddhism, yoga, bahaism, Satya Sai Baba) and Japan (Soka Gakkai and Risho Kosekai) are described, in the countries, where the process of radical secularisation has made the need of a religious dimension more deeply felt. Finally, the influence of non-christian religiosity has subtly penetrated even into the Christian churches and has left a mark on the religious life of Christians, giving its distinctive tinge to the life in religious cloisters and colouring the religiosity of Christian mystics. Jerusalem has been silently deserted while the tame banks of the Ganges are trodden by the feet of weary Christian pilgrims. In the second part of this article will be considered the importance of this change for Christian life.