Comes from the Greek word Sodzo meaning "salvation". Soteriology deals with the provision of salvation through Christ (Christology) and the application of it through the Holy Spirit (Pneumatology)
The doctrine of Christ may indicate both a study of his person and his work. The doctrine of person of Christ is crucial to the Christian faith. It is basic to soteriology, for if our Lord was not what he claimed to be, then his atonement was deficient and insufficient.