Not my field. However, I always recommend an interdisciplinary approach in which different aspects of a problem, question, or issue are addressed by different, appropriate methods.
I'm a New Testament scholar, writing on the Gospel of John. The last chapter is an attempt to sketch a sort of psychohistory of the Johannine movement, with emphasis on the internal schism reflected in 1 John and in parts of the Gospel (eg., 6:60-71). The dissident group entertained a narcissitic relationhsip to the faith object (Jesus, the divine Logos) forming a spiritual "dual unity" (M. Mahler) with omnipotence (cf. John 14:12). They did not accept the tradition about Jesus' death. The group behind the final Gospel accepted the passion story and were somewhat more realistic.. Some degree of (collective) narcissism is inherent in most religious movements, where one believes to be the "elect" and so something "special."
Prof. Greenstein - thank you for your comment! Although I definitely agree with your point, we plan to start with a concise study devoted for exploring small part of personality psychology.
Prof. Syreeni - your remark clearly captures the idea of collective narcissism. In current study we investigate however individual narcissism only, but if you would be interested in collective (and communal collective) narcissism research I would recommend the following project: https://www.researchgate.net/project/Narcissisms-and-self-esteems-in-cross-cultural-context
hi. what an illuminating project . highlighting intercultural differences associated with positive and negative emotions can be considered as a part of cultural literacy of each country for its native speakers and providing data for intercultural competence for multilinguals and multiculturalists. best