Soteriology:
Soteriology (/səˌtɪəriˈɒlədʒi/; Greek: σωτηρία sōtēria “salvation” from σωτήρ sōtēr “savior, preserver” and λόγος logos “study” or “word”[1]) is the study of religious doctrines of salvation. Salvation theory occupies a place of special significance in many religions.
In the academic field of religious studies, soteriology is understood by scholars as representing a key theme in a number of different religions and is often studied in a comparative context; that is, comparing various ideas about what salvation is and how it is obtained. [Wikipedia]
Noted in “Politics is religion, and the right is getting ready for the end times,” Michael Gerson, WaPo:
What I am talking about is the appropriation — really, the profanation — of religious ideas to serve ideological purposes. During the 20th century, this was often the preserve of the left. Marxism provided a soteriology — a theory of salvation — that caused people to die and kill in service to a redemptive ideal. It is what made communism so appealing — and so dangerous. It gave oppression the veneer of idealism.