The article is devoted to the specifics of the study of fundamentalism in social philosophy. Particular attention is given to the demarcation of religious communities in social philosophy with respect to this problem of definition of fundamentalism. To describe the dynamics of change - extremely ductile phenomenon – religious fundamentalism – requires selection of species traits groups. Comparative analysis leads us to the effect of «new religions» or «religion of the New Age». Fundamentalist groups have similarities to the «Religion» New Age.
